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/redis/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/redis/artman_redis_v1beta1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1beta1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/redis/v1beta1/cloud_redis.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1beta1/google/cloud/redis_v1beta1/proto/cloud_redis.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1beta1/google/cloud/redis_v1beta1/proto. synthtool > Running generator for google/cloud/redis/artman_redis_v1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/redis/v1/cloud_redis.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1/google/cloud/redis_v1/proto/cloud_redis.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1/google/cloud/redis_v1/proto. synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern resources of the form:\n ``, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern parent \(str\): Required. The resource name of the instance location using the form: :: `projects/{project_id}/locations/{location_id}` where ``location_id`` refers to a GCP region, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern with the following restrictions: \* Must contain only lowercase letters, numbers, and hyphens\., maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern name \(str\): Required. Redis instance resource name using the form: :: `projects/{project_id}/locations/{location_id}/instances/{instance_id}` where ``location_id`` refers to a GCP region, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern fields from ``Instance``: \* ``displayName`` \* ``labels`` \* ``memorySizeGb`` \* ``redisConfig``, maybe replacement is not longer needed? .coveragerc .flake8 MANIFEST.in noxfile.py.j2 setup.cfg Running session blacken Creating virtualenv using python3.6 in /tmpfs/src/git/autosynth/working_repo/redis/.nox/blacken pip install --upgrade black black google tests docs reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/gapic/transports/cloud_redis_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/gapic/cloud_redis_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/types.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/proto/cloud_redis_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/gapic/cloud_redis_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/gapic/cloud_redis_client.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/gapic/transports/cloud_redis_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/proto/cloud_redis_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/types.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/gapic/cloud_redis_client.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/tests/unit/gapic/v1/test_cloud_redis_client_v1.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/tests/unit/gapic/v1beta1/test_cloud_redis_client_v1beta1.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1beta1/proto/cloud_redis_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/redis/google/cloud/redis_v1/proto/cloud_redis_pb2.py All done! ✨ 🍰 ✨ 21 files reformatted, 7 files left unchanged. Session blacken was successful. synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata.