docs: update documentation

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Commits in this repo since last synth:
3adb76e chore: release 0.125.0 (#2661)
42ad09a test: fix broken system test (#2688)
4418059 feat: add ServiceMonitoringServiceClient; update clients (#2668)
d89b430 feat: update required version of google/cloud-core (#2687)
d8cd161 feat: add getPrivateProperty test helper (#2686)
bc27230 fix: update metadata (#2680)
f6884af feat: introduce security center v1p1beta1 (#2681)
081fc94 feat: update timeouts and documentation (#2683)
f54af5d feat!: update client method signatures and deprecate old proper… (#2684)
ac533e9 chore: update metadata (#2685)
e8b60da feat: add cmek methods and sink description and disabled toggle (#2678)
57d05f1 feat!: rename formatting method and update listGroupStats signa… (#2677)
49a7ecc revert: fix breaking change in errorreporting gapic (#2665) (#2675)

Log from Synthtool

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/Redis/synth.py.
On branch autosynth-redis
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/cloud/redis/artman_redis_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/php/google-cloud-redis-v1beta1.
synthtool > Running generator for google/cloud/redis/artman_redis_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/php/google-cloud-redis-v1.
synthtool > Replaced "'serviceAddress' =>" in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced "'serviceAddress' =>" in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '@type string \\$serviceAddress\\n\\s+\\*\\s+The address' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '@type string \\$serviceAddress\\n\\s+\\*\\s+The address' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '\\$transportConfig, and any \\$serviceAddress' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '\\$transportConfig, and any \\$serviceAddress' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'Copyright \\d{4}' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'Copyright \\d{4}' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/System/V1/CloudRedisClientTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/System/V1beta1/CloudRedisClientTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V1/CloudRedisClientTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V1/CloudRedisClientPartialVeneerTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V1beta1/CloudRedisClientTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V1beta1/CloudRedisClientPartialVeneerTest.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1/Instance_ConnectMode.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1/Instance_Tier.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1/FailoverInstanceRequest_DataProtectionMode.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1/Instance_State.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1beta1/Instance_ConnectMode.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1beta1/Instance_Tier.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1beta1/FailoverInstanceRequest_DataProtectionMode.php.
synthtool > Replaced 'will be removed in the next major release' in src/V1beta1/Instance_State.php.
synthtool > Replaced 'new CloudRedisClient' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new Instance' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '= Tier::' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new FieldMask' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new InputConfig' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new OutputConfig' in src/V1/Gapic/CloudRedisGapicClient.php.
synthtool > No replacements made in src/V1/Gapic/CloudRedisGapicClient.php for pattern = DataProtectionMode, maybe replacement is not longer needed?
synthtool > Replaced 'new CloudRedisClient' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new Instance' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced '= Tier::' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new FieldMask' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new InputConfig' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > Replaced 'new OutputConfig' in src/V1beta1/Gapic/CloudRedisGapicClient.php.
synthtool > No replacements made in src/V1beta1/Gapic/CloudRedisGapicClient.php for pattern = DataProtectionMode, maybe replacement is not longer needed?
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/ExportInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/DeleteInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/CreateInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/FailoverInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/GetInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/GcsDestination.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/UpdateInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/GcsSource.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/ListInstancesRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/ImportInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/ListInstancesResponse.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/Instance.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1/OperationMetadata.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/ExportInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/DeleteInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/UpgradeInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/CreateInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/FailoverInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/GetInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/GcsDestination.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/UpdateInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/GcsSource.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/ListInstancesRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/ImportInstanceRequest.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/ListInstancesResponse.php.
synthtool > Replaced 'Generated from protobuf field ([^\\n]{0,})\\n\\s{5}\\*/\\n\\s{4}protected \\$' in src/V1beta1/Instance.php.
synthtool > No replacements made in src/**/V*/**/*.php for pattern final class, maybe replacement is not longer needed?
synthtool > No replacements made in src/**/V*/**/*.php for pattern public function ([s|g]\w{3,})Unwrapped, maybe replacement is not longer needed?
synthtool > Wrote metadata to synth.metadata.