chore: change docstring line breaks (via synth)

This PR was generated using Autosynth. 🌈

Commits in this repo since last synth:


<details><summary>Log from Synthtool</summary>

```
synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
On branch autosynth
nothing to commit, working tree clean
HEAD detached at FETCH_HEAD
nothing to commit, working tree clean
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:6aec9c34db0e4be221cdaf6faba27bdc07cfea846808b3d3b964dfce3a9a0f9b
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/devtools/cloudbuild/artman_cloudbuild.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudbuild-v1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/devtools/cloudbuild/v1/cloudbuild.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudbuild-v1/google/cloud/cloudbuild_v1/proto/cloudbuild.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudbuild-v1/google/cloud/cloudbuild_v1/proto.
synthtool > Replaced 'from google.devtools.cloudbuild_v1.proto import ' in google/cloud/devtools/cloudbuild_v1/proto/cloudbuild_pb2_grpc.py.
synthtool > Replaced 'google-cloud-cloudbuild' in docs/conf.py.
synthtool > Replaced 'google-cloud-cloudbuild' in google/cloud/devtools/cloudbuild_v1/gapic/cloud_build_client.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
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/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/docs/conf.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/gapic/cloud_build_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/gapic/transports/cloud_build_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/noxfile.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/proto/cloudbuild_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/gapic/cloud_build_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/tests/unit/gapic/v1/test_cloud_build_client_v1.py
reformatted /tmpfs/src/git/autosynth/working_repo/google/cloud/devtools/cloudbuild_v1/proto/cloudbuild_pb2.py
All done! ✨ 🍰 ✨
14 files reformatted, 5 files left unchanged.
Session blacken was successful.
synthtool > Wrote metadata to synth.metadata.

```
</details>

packages/google-cloud-build/synth.metadata

@@ -1,5 +1,5 @@
 {
-  "updateTime": "2020-02-19T02:18:35.535081Z",
+  "updateTime": "2020-02-21T13:14:21.174689Z",
   "sources": [
     {
       "generator": {
@@ -12,23 +12,23 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-cloudbuild.git",
-        "sha": "404cdb753f293f5ba3722a54bff0b3b0f4313620"
+        "sha": "a63d2789f3084d2efa42114f158c043b4eb0057d"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "ce4f4c21d9dd2bfab18873a80449b9d9851efde8",
-        "internalRef": "295861722",
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TimeSeries is not a named resource.\n\nPiperOrigin-RevId: 294931650\n\n0646bc775203077226c2c34d3e4d50cc4ec53660\nRemove unnecessary languages from bigquery-related artman configuration files.\n\nPiperOrigin-RevId: 294809380\n\n8b78aa04382e3d4147112ad6d344666771bb1909\nUpdate backend.proto for schemes and protocol\n\nPiperOrigin-RevId: 294788800\n\n80b8f8b3de2359831295e24e5238641a38d8488f\nAdds artman config files for bigquerystorage endpoints v1beta2, v1alpha2, v1\n\nPiperOrigin-RevId: 294763931\n\n2c17ac33b226194041155bb5340c3f34733f1b3a\nAdd parameter to sample generated for UpdateInstance. 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(Otherwise, it will not build.)\n\nPiperOrigin-RevId: 294264582\n\n6d9361eae2ebb3f42d8c7ce5baf4bab966fee7c0\nrefactor: Add annotations to Bigtable Admin v2.\n\nPiperOrigin-RevId: 294243406\n\nad7616f3fc8e123451c8b3a7987bc91cea9e6913\nFix: Resource type in CreateLogMetricRequest should use logging.googleapis.com.\nFix: ListLogEntries should have a method signature for convenience of calling it.\n\nPiperOrigin-RevId: 294222165\n\n63796fcbb08712676069e20a3e455c9f7aa21026\nFix: Remove extraneous resource definition for cloudkms.googleapis.com/CryptoKey.\n\nPiperOrigin-RevId: 294176658\n\ne7d8a694f4559201e6913f6610069cb08b39274e\nDepend on the latest gapic-generator and resource names plugin.\n\nThis fixes the very old an very annoying bug: https://github.com/googleapis/gapic-generator/pull/3087\n\nPiperOrigin-RevId: 293903652\n\n806b2854a966d55374ee26bb0cef4e30eda17b58\nfix: correct capitalization of Ruby namespaces in SecurityCenter V1p1beta1\n\nPiperOrigin-RevId: 293903613\n\n1b83c92462b14d67a7644e2980f723112472e03a\nPublish annotations and grpc service config for Logging API.\n\nPiperOrigin-RevId: 293893514\n\ne46f761cd6ec15a9e3d5ed4ff321a4bcba8e8585\nGenerate the Bazel build file for recommendengine public api\n\nPiperOrigin-RevId: 293710856\n\n68477017c4173c98addac0373950c6aa9d7b375f\nMake `language_code` optional for UpdateIntentRequest and BatchUpdateIntentsRequest.\n\nThe comments and proto annotations describe this parameter as optional.\n\nPiperOrigin-RevId: 293703548\n\n16f823f578bca4e845a19b88bb9bc5870ea71ab2\nAdd BUILD.bazel files for managedidentities API\n\nPiperOrigin-RevId: 293698246\n\n2f53fd8178c9a9de4ad10fae8dd17a7ba36133f2\nAdd v1p1beta1 config file\n\nPiperOrigin-RevId: 293696729\n\n052b274138fce2be80f97b6dcb83ab343c7c8812\nAdd source field for user event and add field behavior annotations\n\nPiperOrigin-RevId: 293693115\n\n1e89732b2d69151b1b3418fff3d4cc0434f0dded\ndatacatalog: v1beta1 add three new RPCs to gapic v1beta1 config\n\nPiperOrigin-RevId: 293692823\n\n9c8bd09bbdc7c4160a44f1fbab279b73cd7a2337\nchange the name of AccessApproval service to AccessApprovalAdmin\n\nPiperOrigin-RevId: 293690934\n\n2e23b8fbc45f5d9e200572ca662fe1271bcd6760\nAdd ListEntryGroups method, add http bindings to support entry group tagging, and update some comments.\n\nPiperOrigin-RevId: 293666452\n\n0275e38a4ca03a13d3f47a9613aac8c8b0d3f1f2\nAdd proto_package field to managedidentities API. It is needed for APIs that still depend on artman generation.\n\nPiperOrigin-RevId: 293643323\n\n4cdfe8278cb6f308106580d70648001c9146e759\nRegenerating public protos for Data Catalog to add new Custom Type Entry feature.\n\nPiperOrigin-RevId: 293614782\n\n45d2a569ab526a1fad3720f95eefb1c7330eaada\nEnable client generation for v1 ManagedIdentities API.\n\nPiperOrigin-RevId: 293515675\n\n2c17086b77e6f3bcf04a1f65758dfb0c3da1568f\nAdd the Actions on Google common types (//google/actions/type/*).\n\nPiperOrigin-RevId: 293478245\n\n781aadb932e64a12fb6ead7cd842698d99588433\nDialogflow weekly v2/v2beta1 library update:\n- Documentation updates\nImportant updates are also posted at\nhttps://cloud.google.com/dialogflow/docs/release-notes\n\nPiperOrigin-RevId: 293443396\n\ne2602608c9138c2fca24162720e67f9307c30b95\nDialogflow weekly v2/v2beta1 library update:\n- Documentation updates\nImportant updates are also posted at\nhttps://cloud.google.com/dialogflow/docs/release-notes\n\nPiperOrigin-RevId: 293442964\n\nc8aef82028d06b7992278fa9294c18570dc86c3d\nAdd cc_proto_library and cc_grpc_library targets for Bigtable protos.\n\nAlso fix indentation of cc_grpc_library targets in Spanner and IAM protos.\n\nPiperOrigin-RevId: 293440538\n\ne2faab04f4cb7f9755072330866689b1943a16e9\ncloudtasks: v2 replace non-standard retry params in gapic config v2\n\nPiperOrigin-RevId: 293424055\n\ndfb4097ea628a8470292c6590a4313aee0c675bd\nerrorreporting: v1beta1 add legacy artman config for php\n\nPiperOrigin-RevId: 293423790\n\nb18aed55b45bfe5b62476292c72759e6c3e573c6\nasset: v1p1beta1 updated comment for `page_size` limit.\n\nPiperOrigin-RevId: 293421386\n\nc9ef36b7956d9859a2fc86ad35fcaa16958ab44f\nbazel: Refactor CI build scripts\n\nPiperOrigin-RevId: 293387911\n\na8ed9d921fdddc61d8467bfd7c1668f0ad90435c\nfix: set Ruby module name for OrgPolicy\n\nPiperOrigin-RevId: 293257997\n\n6c7d28509bd8315de8af0889688ee20099594269\nredis: v1beta1 add UpgradeInstance and connect_mode field to Instance\n\nPiperOrigin-RevId: 293242878\n\nae0abed4fcb4c21f5cb67a82349a049524c4ef68\nredis: v1 add connect_mode field to Instance\n\nPiperOrigin-RevId: 293241914\n\n3f7a0d29b28ee9365771da2b66edf7fa2b4e9c56\nAdds service config definition for bigqueryreservation v1beta1\n\nPiperOrigin-RevId: 293234418\n\n0c88168d5ed6fe353a8cf8cbdc6bf084f6bb66a5\naddition of BUILD & configuration for accessapproval v1\n\nPiperOrigin-RevId: 293219198\n\n39bedc2e30f4778ce81193f6ba1fec56107bcfc4\naccessapproval: v1 publish protos\n\nPiperOrigin-RevId: 293167048\n\n69d9945330a5721cd679f17331a78850e2618226\nAdd file-level `Session` resource definition\n\nPiperOrigin-RevId: 293080182\n\nf6a1a6b417f39694275ca286110bc3c1ca4db0dc\nAdd file-level `Session` resource definition\n\nPiperOrigin-RevId: 293080178\n\n29d40b78e3dc1579b0b209463fbcb76e5767f72a\nExpose managedidentities/v1beta1/ API for client library usage.\n\nPiperOrigin-RevId: 292979741\n\na22129a1fb6e18056d576dfb7717aef74b63734a\nExpose managedidentities/v1/ API for client library usage.\n\nPiperOrigin-RevId: 292968186\n\nb5cbe4a4ba64ab19e6627573ff52057a1657773d\nSecurityCenter v1p1beta1: move file-level option on top to workaround protobuf.js bug.\n\nPiperOrigin-RevId: 292647187\n\nb224b317bf20c6a4fbc5030b4a969c3147f27ad3\nAdds API definitions for bigqueryreservation v1beta1.\n\nPiperOrigin-RevId: 292634722\n\nc1468702f9b17e20dd59007c0804a089b83197d2\nSynchronize new proto/yaml changes.\n\nPiperOrigin-RevId: 292626173\n\nffdfa4f55ab2f0afc11d0eb68f125ccbd5e404bd\nvision: v1p3beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292605599\n\n78f61482cd028fc1d9892aa5d89d768666a954cd\nvision: v1p1beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292605125\n\n60bb5a294a604fd1778c7ec87b265d13a7106171\nvision: v1p2beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292604980\n\n3bcf7aa79d45eb9ec29ab9036e9359ea325a7fc3\nvision: v1p4beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292604656\n\n"
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