chore(spanner): change docstring line breaks (via synth)

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Commits in this repo since last synth:
386f738 Merge pull request #1 from googleapis/repo-templates
37e83a1 fix: adjust coverage
f9fe89a fix: noxfile exclude
5a13747 fix: add test_utils

Log from Synthtool

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:19e945954fc960a4bdfee6cb34695898ab21a8cf0bac063ee39b91f00a1faec8
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/spanner/artman_spanner.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/mutation.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/mutation.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/spanner.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/spanner.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/type.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/type.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/keys.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/keys.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/result_set.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/result_set.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/transaction.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/transaction.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/v1/query_plan.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto/query_plan.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-v1/google/cloud/spanner_v1/proto.
synthtool > Replaced 'import google.api_core.grpc_helpers\n' in google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py.
synthtool > Replaced 'from google.cloud.spanner_v1.proto import spanner_pb2_grpc\n' in google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py.
synthtool > Replaced '(\\s+)return google.api_core.grpc_helpers.create_channel\\(\n' in google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py.
synthtool > Replaced 'from google.cloud import spanner_v1' in tests/unit/gapic/v1/test_spanner_client_v1.py.
synthtool > Running generator for google/spanner/admin/instance/artman_spanner_admin_instance.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-instance-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/admin/instance/v1/spanner_instance_admin.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-instance-v1/google/cloud/spanner_admin_instance_v1/proto/spanner_instance_admin.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-instance-v1/google/cloud/spanner_admin_instance_v1/proto.
synthtool > Replaced "'google-cloud-spanner-admin-instance'" in google/cloud/spanner_admin_instance_v1/gapic/instance_admin_client.py.
synthtool > Replaced 'from google\\.cloud\\.spanner\\.admin\\.instance_v1.proto' in google/cloud/spanner_admin_instance_v1/proto/spanner_instance_admin_pb2_grpc.py.
synthtool > Replaced '====*' in google/cloud/spanner_v1/proto/transaction_pb2.py.
synthtool > Replaced '----*' in google/cloud/spanner_v1/proto/transaction_pb2.py.
synthtool > Replaced '~~~~*' in google/cloud/spanner_v1/proto/transaction_pb2.py.
synthtool > Running generator for google/spanner/admin/database/artman_spanner_admin_database.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-database-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/spanner/admin/database/v1/spanner_database_admin.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-database-v1/google/cloud/spanner_admin_database_v1/proto/spanner_database_admin.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/spanner-admin-database-v1/google/cloud/spanner_admin_database_v1/proto.
synthtool > Replaced "'google-cloud-spanner-admin-database'" in google/cloud/spanner_admin_database_v1/gapic/database_admin_client.py.
synthtool > Replaced 'from google\\.cloud\\.spanner\\.admin\\.database_v1.proto' in google/cloud/spanner_admin_database_v1/proto/spanner_database_admin_pb2_grpc.py.
synthtool > Replaced '"""Attributes:' in google/cloud/spanner_admin_instance_v1/proto/spanner_instance_admin_pb2.py.
.coveragerc
.flake8
.github/CONTRIBUTING.md
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.github/PULL_REQUEST_TEMPLATE.md
.github/release-please.yml
.gitignore
.kokoro/build.sh
.kokoro/continuous/common.cfg
.kokoro/continuous/continuous.cfg
.kokoro/docs/common.cfg
.kokoro/docs/docs.cfg
.kokoro/presubmit/common.cfg
.kokoro/presubmit/presubmit.cfg
.kokoro/publish-docs.sh
.kokoro/release.sh
.kokoro/release/common.cfg
.kokoro/release/release.cfg
.kokoro/trampoline.sh
CODE_OF_CONDUCT.md
CONTRIBUTING.rst
LICENSE
MANIFEST.in
docs/_static/custom.css
docs/_templates/layout.html
docs/conf.py.j2
noxfile.py.j2
renovate.json
setup.cfg
synthtool > Replaced 'include README.rst LICENSE\n' in MANIFEST.in.
Running session blacken
Creating virtual environment (virtualenv) using python3.6 in .nox/blacken
pip install black==19.3b0
black docs google tests noxfile.py setup.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/gapic/database_admin_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/docs/conf.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/gapic/transports/database_admin_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/proto/spanner_database_admin_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/gapic/instance_admin_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/gapic/transports/instance_admin_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/gapic/database_admin_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/gapic/instance_admin_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/proto/spanner_instance_admin_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_database_v1/proto/spanner_database_admin_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/gapic/spanner_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/keys_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/keys_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/mutation_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/gapic/spanner_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/query_plan_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/mutation_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/result_set_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/query_plan_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_admin_instance_v1/proto/spanner_instance_admin_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/result_set_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/transaction_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/spanner_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/type_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/type_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/transaction_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/tests/unit/gapic/v1/test_database_admin_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/tests/unit/gapic/v1/test_instance_admin_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/tests/unit/gapic/v1/test_spanner_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/spanner_v1/proto/spanner_pb2.py
All done! ✨ 🍰 ✨
34 files reformatted, 54 files left unchanged.
Session blacken was successful.
synthtool > Wrote metadata to synth.metadata.