Asset: Add nox session docs, add routing header to method metadata (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/asset/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
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Digest: sha256:d3df563538225ac6caac45d8ad86499500211d1bcb2536955a6dbda15e1b368e
Status: Downloaded newer image for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/asset/artman_cloudasset_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1beta1/assets.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto/assets.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1beta1/asset_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto/asset_service.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1beta1/google/cloud/asset_v1beta1/proto.
synthtool > Running generator for google/cloud/asset/artman_cloudasset_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1/assets.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1/google/cloud/asset_v1/proto/assets.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/asset/v1/asset_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1/google/cloud/asset_v1/proto/asset_service.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/asset-v1/google/cloud/asset_v1/proto.
synthtool > Replaced 'from google.iam.v1 import policy_pb2 as' in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced 'from google.iam.v1 import policy_pb2 as' in google/cloud/asset_v1/proto/assets_pb2.py.
synthtool > Replaced 'from google.iam.v1 import iam_policy_pb2_grpc as google_dot_iam_dot_v1_dot_policy__pb2' in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced 'from google.iam.v1 import iam_policy_pb2_grpc as google_dot_iam_dot_v1_dot_policy__pb2' in google/cloud/asset_v1/proto/assets_pb2.py.
synthtool > Replaced "_ASSET.fields_by_name\\['iam_policy'\\].message_type = google_dot_iam_dot_v1_dot_policy__pb2._POLICY" in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced "_ASSET.fields_by_name\\['iam_policy'\\].message_type = google_dot_iam_dot_v1_dot_policy__pb2._POLICY" in google/cloud/asset_v1/proto/assets_pb2.py.
synthtool > Replaced '          The full name of the asset. For example: ``//compute.googleapi\n          s.com/projects/my_project_123/zones/zone1/instances/instance1`\n          `. See `Resource Names <https://cloud.google.com/apis/design/r\n          esource_names#full_resource_name>`__ for more information.\n' in google/cloud/asset_v1beta1/proto/assets_pb2.py.
synthtool > Replaced '          The full name of the asset. For example: ``//compute.googleapi\n          s.com/projects/my_project_123/zones/zone1/instances/instance1`\n          `. See `Resource Names <https://cloud.google.com/apis/design/r\n          esource_names#full_resource_name>`__ for more information.\n' in google/cloud/asset_v1/proto/assets_pb2.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/asset/.nox/blacken
pip install black
black google tests docs
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/gapic/asset_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/gapic/transports/asset_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/proto/asset_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/proto/assets_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/gapic/asset_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/asset_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/proto/assets_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/assets_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/tests/unit/gapic/v1/test_asset_service_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1/proto/asset_service_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py
All done! ✨ 🍰 ✨
25 files reformatted, 7 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 3 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[busunkim96]

Ignoring failing tests in unrelated APIs: Translation, reCAPTCHA Enterprise