chore(documentai): change line breaks in docstring (via synth)

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Commits in this repo since last synth:
88e060f chore(storage): adjust test assertions to new default timeout (#10251)
fcdc10c chore(bigquery): adjust test assertions to new default timeout (#10222)
79d8e00 fix(translate): add py2 deprecation warning; bump copyright year to 2020; add 3.8 unit tests (via synth) (#9943)
ca7f003 fix(oslogin): add py2 deprecation warning; bump copyright year to 2020; add 3.8 unit tests (via synth) (#10071)
b270311 docs(webrisk): add 2.7 deprecation warning; bump copyright year to 2020; use templated noxfile (via synth) (#10053)
906e5fa feat(spanner): un-deprecate resource name helper functions, add 3.8 tests (via synth) (#10062)
2a86088 feat(monitoring): un-deprecate resource name helpers, add 2.7 sunset warning; bump copyright year to 2020; use templated noxfile (via synth) (#10047)
4d90329 docs(firestore): standardize use of 'required' and 'optional' in docstrings; add py2 deprecation warning; add 3.8 unit tests (via synth) (#10068)
0e75d9e docs(language): change docstring formatting; bump copyright year to 2020 (via synth) (#10234)
c140711 feat(grafeas): add support for upgrade notes; add cpe and last_scan_time to DiscoveryOccurrence; add source_update_time to VulnerabilityNote (via synth) (#10084)
e113605 chore(asset): bump copyright year to 2020, tweak docstring formatting (via synth) (#10223)
c165d1f feat(bigquerydatatransfer): undeprecate resource name helper methods; add py2 deprecation warning; bump copyright year to 2020 (via synth) (#10226)
e40e711 chore(phishingprotection): bump copyright year to 2020 (via synth) (#10235)
21766c4 docs(datalabeling): update docstrings; bump copyright year to 2020 (via synth) (#10229)
96b9553 fix(irm): change default retry and timeout config; bump copyright year to 2020 (via synth) (#10233)
a82c74e fix(talent): change default timeout values; edit docstrings; bump copyright year to 2020 (via synth) (#10239)
40c1473 docs(dlp): standardize use of 'required', 'optional' in docstrings; add descriptions to enums (via synth) (#10103)
211f8c7 feat(kms): add ProtectionLevel.External enum; standardize use of 'optional' and 'required' in docstrings (via synth) (#10070)
ccbec02 docs(cloudbuild): edit docstrings; add py2 deprecation warning; add 3.8 tests (via synth) (#10092)
f478b36 feat(tasks): undeprecate resource helper methods; add py2 deprecation warning; change default timeouts; add 3.8 tests; edit docstrings (via synth)(#10074)
13d8a87 docs(dataproc): remove 'cloud' from references to dataproc; add py2 deprecation warning; add 3.8 tests (via synth) (#10066)
ee342a8 chore(containeranalysis): add py2 deprecation warning, add 3.8 tests (via synth) (#10065)
3f0f011 feat(bigtable): add py2 deprecation warnings; standardize use of 'required' in docstrings (via synth) (#10064)
dad70a7 chore(speech): bump copyright year to 2020, tweak docstring formatting (via synth) (#10238)
3a9845c chore(asset): release 0.7.0 (#10244)
a220e73 chore(redis): bump copyright year to 2020, tweak docstring formatting (via synth) (#10237)
51b16f0 chore(iot): bump copyright year to 2020 (via synth) (#10232)
055967a fix(iam): bump copyright year to 2020 (via synth) (#10231)

Log from Synthtool

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/documentai/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/cloud/documentai/artman_documentai_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/documentai-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/documentai/v1beta1/document_understanding.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/documentai-v1beta1/google/cloud/documentai_v1beta1/proto/document_understanding.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/documentai/v1beta1/document.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/documentai-v1beta1/google/cloud/documentai_v1beta1/proto/document.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/documentai/v1beta1/geometry.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/documentai-v1beta1/google/cloud/documentai_v1beta1/proto/geometry.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/documentai-v1beta1/google/cloud/documentai_v1beta1/proto.
synthtool > No replacements made in google/cloud/**/document_understanding_pb2.py for pattern \| Specifies a known document type for deeper structure
          detection\. Valid   values are currently "general" and
          "invoice"\. If not provided,   "general" \| is used as default.
          If any other value is given, the request is   rejected\., maybe replacement is not longer needed?
.coveragerc
.flake8
MANIFEST.in
docs/_static/custom.css
docs/_templates/layout.html
noxfile.py.j2
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/documentai/google/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/gapic/document_understanding_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/gapic/transports/document_understanding_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/document_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/docs/conf.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/document_understanding_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/gapic/document_understanding_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/geometry_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/noxfile.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/geometry_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/tests/unit/gapic/v1beta1/test_document_understanding_service_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/document_understanding_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/documentai/google/cloud/documentai_v1beta1/proto/document_pb2.py
All done! ✨ 🍰 ✨
18 files reformatted, 4 files left unchanged.
Session blacken was successful.
synthtool > Wrote metadata to synth.metadata.