doc: update resource docstrings (#60)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore(python): use BUILD_SPECIFIC_GCLOUD_PROJECT for samples

https://github.com/googleapis/python-talent/blob/ef045e8eb348db36d7a2a611e6f26b11530d273b/samples/snippets/noxfile_config.py#L27-L32

`BUILD_SPECIFIC_GCLOUD_PROJECT` is an alternate project used for sample tests that do poorly with concurrent runs on the same project.

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Wed Sep 30 13:06:03 2020 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 9b0da5204ab90bcc36f8cd4e5689eff1a54cc3e4
Source-Link: googleapis/synthtool@9b0da52

* chore(python): use 'setup.py' to detect repo root

Closes #792

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Fri Oct 9 15:06:33 2020 -0600
Source-Repo: googleapis/synthtool
Source-Sha: e0ae456852bf22f38796deb79cff30b516fde244
Source-Link: googleapis/synthtool@e0ae456

* build(python): samples tests should pass if no samples exist

Source-Author: Daniel Sanche <d.sanche14@gmail.com>
Source-Date: Wed Oct 14 08:00:06 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 477764cc4ee6db346d3febef2bb1ea0abf27de52
Source-Link: googleapis/synthtool@477764c

Author: yoshi-automation

bigquery_storage/quickstart/noxfile.py

@@ -199,6 +199,11 @@ def _get_repo_root():
             break
         if Path(p / ".git").exists():
             return str(p)
+        # .git is not available in repos cloned via Cloud Build
+        # setup.py is always in the library's root, so use that instead
+        # https://github.com/googleapis/synthtool/issues/792
+        if Path(p / "setup.py").exists():
+            return str(p)
         p = p.parent
     raise Exception("Unable to detect repository root.")
 

bigquery_storage/to_dataframe/noxfile.py

@@ -199,6 +199,11 @@ def _get_repo_root():
             break
         if Path(p / ".git").exists():
             return str(p)
+        # .git is not available in repos cloned via Cloud Build
+        # setup.py is always in the library's root, so use that instead
+        # https://github.com/googleapis/synthtool/issues/792
+        if Path(p / "setup.py").exists():
+            return str(p)
         p = p.parent
     raise Exception("Unable to detect repository root.")