chore: clean up comment that's no longer relevant

The comment is now in `start-envoy.sh`.

Author: thebengeu

docker/all-in-one/etc/supervisor/services/envoy.conf

@@ -1,6 +1,4 @@
 [program:envoy]
-# Workaround using `tee` to get `/dev/stdout` access logging to work, see:
-# https://github.com/envoyproxy/envoy/issues/8297#issuecomment-620659781
 command=/opt/envoy-hot-restarter.py /opt/start-envoy.sh
 user=envoy
 autorestart=true