Add clarifying comment to blacken nox target.

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/videointelligence/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:5fd9aee1d82a00cebf425c8fa431f5457539562f5867ad9c54370f0ec9a7ccaa
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/videointelligence/artman_videointelligence_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/videointelligence/v1beta1/video_intelligence.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta1/google/cloud/videointelligence_v1beta1/proto/video_intelligence.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta1/google/cloud/videointelligence_v1beta1/proto.
synthtool > Running generator for google/cloud/videointelligence/artman_videointelligence_v1beta2.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta2.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/videointelligence/v1beta2/video_intelligence.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta2/google/cloud/videointelligence_v1beta2/proto/video_intelligence.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1beta2/google/cloud/videointelligence_v1beta2/proto.
synthtool > Running generator for google/cloud/videointelligence/artman_videointelligence_v1p1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/videointelligence/v1p1beta1/video_intelligence.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p1beta1/google/cloud/videointelligence_v1p1beta1/proto/video_intelligence.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p1beta1/google/cloud/videointelligence_v1p1beta1/proto.
synthtool > Running generator for google/cloud/videointelligence/artman_videointelligence_v1p2beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p2beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/videointelligence/v1p2beta1/video_intelligence.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p2beta1/google/cloud/videointelligence_v1p2beta1/proto/video_intelligence.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1p2beta1/google/cloud/videointelligence_v1p2beta1/proto.
synthtool > Running generator for google/cloud/videointelligence/artman_videointelligence_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/videointelligence/v1/video_intelligence.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1/google/cloud/videointelligence_v1/proto/video_intelligence.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/video-intelligence-v1/google/cloud/videointelligence_v1/proto.
synthtool > Replaced "'google-cloud-video-intelligence', \\).version" in google/cloud/videointelligence_v1beta2/gapic/video_intelligence_service_client.py.
synthtool > Replaced "'google-cloud-video-intelligence', \\).version" in google/cloud/videointelligence_v1/gapic/video_intelligence_service_client.py.
synthtool > Replaced "'google-cloud-video-intelligence', \\).version" in google/cloud/videointelligence_v1p1beta1/gapic/video_intelligence_service_client.py.
synthtool > Replaced "'google-cloud-video-intelligence', \\).version" in google/cloud/videointelligence_v1beta1/gapic/video_intelligence_service_client.py.
synthtool > Replaced "'google-cloud-video-intelligence', \\).version" in google/cloud/videointelligence_v1p2beta1/gapic/video_intelligence_service_client.py.
synthtool > Replaced '^(\\s+)expected_request = video_intelligence_pb2.AnnotateVideoRequest\\(\\)' in tests/unit/gapic/v1p1beta1/test_video_intelligence_service_client_v1p1beta1.py.
synthtool > Replaced '^(\\s+)expected_request = video_intelligence_pb2.AnnotateVideoRequest\\(\\)' in tests/unit/gapic/v1beta2/test_video_intelligence_service_client_v1beta2.py.
synthtool > Replaced '^(\\s+)expected_request = video_intelligence_pb2.AnnotateVideoRequest\\(\\)' in tests/unit/gapic/v1p2beta1/test_video_intelligence_service_client_v1p2beta1.py.
synthtool > Replaced '^(\\s+)expected_request = video_intelligence_pb2.AnnotateVideoRequest\\(\\)' in tests/unit/gapic/v1/test_video_intelligence_service_client_v1.py.
.coveragerc
.flake8
MANIFEST.in
noxfile.py.j2
setup.cfg
Running session blacken
Creating virtualenv using python3.6 in /tmpfs/src/git/autosynth/working_repo/videointelligence/.nox/blacken
pip install --upgrade black
black google tests docs
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/gapic/video_intelligence_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/gapic/transports/video_intelligence_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/docs/conf.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/proto/video_intelligence_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/gapic/video_intelligence_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/gapic/transports/video_intelligence_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/gapic/video_intelligence_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/proto/video_intelligence_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/gapic/video_intelligence_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/gapic/transports/video_intelligence_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/gapic/video_intelligence_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/gapic/video_intelligence_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/proto/video_intelligence_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/gapic/transports/video_intelligence_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/gapic/video_intelligence_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/gapic/video_intelligence_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta1/proto/video_intelligence_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/proto/video_intelligence_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/gapic/transports/video_intelligence_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/gapic/video_intelligence_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/gapic/video_intelligence_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1beta2/proto/video_intelligence_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/proto/video_intelligence_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/tests/unit/gapic/v1/test_video_intelligence_service_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1/proto/video_intelligence_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/tests/unit/gapic/v1beta1/test_video_intelligence_service_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p1beta1/proto/video_intelligence_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/tests/unit/gapic/v1beta2/test_video_intelligence_service_client_v1beta2.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/tests/unit/gapic/v1p1beta1/test_video_intelligence_service_client_v1p1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/tests/unit/gapic/v1p2beta1/test_video_intelligence_service_client_v1p2beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/videointelligence/google/cloud/videointelligence_v1p2beta1/proto/video_intelligence_pb2.py
All done! ✨ 🍰 ✨
49 files reformatted, 15 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.