Bulk client regen - builder documentation and Generated annotation

[chingor13]

Combining multiple, similar PRs into a single PR:

• Regenerate automl client (Regenerate automl client #5865)
• Regenerate datalabeling client (Regenerate datalabeling client #5866)
• Regenerate dialogflow client (Regenerate dialogflow client #5867)
• Regenerate gameservices client (Regenerate gameservices client #5868)
• Regenerate redis client (Regenerate redis client #5869)
• Regenerate securitycenter client (Regenerate securitycenter client #5870)
• Regenerate translate client (Regenerate translate client #5872)
• Regenerate video-intelligence client (Regenerate video-intelligence client #5873)
• Regenerate vision client (Regenerate vision client #5874)

This is similar to #5850 - these were clients that had outstanding synth PRs so they weren't regenerated at the same time.

[codecov]

Codecov Report

Merging #5880 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5880 +/- ##
============================================
+ Coverage 46.79% 46.8% +<.01% - Complexity 25648 25670 +22 
============================================
Files 2456 2456 Lines 267593 267745 +152 Branches 30564 30566 +2 ============================================
+ Hits 125229 125313 +84 - Misses 133105 133175 +70 + Partials 9259 9257 -2

Impacted Files	Coverage Δ	Complexity Δ
...ml/v1beta1/stub/PredictionServiceStubSettings.java	83.18% <ø> (ø)	12 <0> (ø)	⬇️
.../cloud/dialogflow/v2beta1/EntityTypesSettings.java	12.28% <ø> (ø)	2 <0> (ø)	⬇️
...le/cloud/gaming/v1alpha/RealmsServiceSettings.java	16.27% <ø> (ø)	2 <0> (ø)	⬇️
...sion/v1p4beta1/stub/ProductSearchStubSettings.java	81.87% <ø> (ø)	29 <0> (ø)	⬇️
...gflow/v2beta1/stub/KnowledgeBasesStubSettings.java	80.3% <ø> (ø)	15 <0> (ø)	⬇️
...ce/v1p2beta1/VideoIntelligenceServiceSettings.java	21.87% <ø> (ø)	2 <0> (ø)	⬇️
...ud/dialogflow/v2/stub/EntityTypesStubSettings.java	87.22% <ø> (ø)	25 <0> (ø)	⬇️
.../com/google/cloud/redis/v1/CloudRedisSettings.java	12.72% <ø> (ø)	2 <0> (ø)	⬇️
...loud/vision/v1/stub/ProductSearchStubSettings.java	81.87% <ø> (ø)	29 <0> (ø)	⬇️
...le/cloud/dialogflow/v2beta1/DocumentsSettings.java	15.55% <ø> (ø)	2 <0> (ø)	⬇️
... and 78 more

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