Add useRevisions hook docs to React SDK and Revisions guides

[hackerwins]

What this PR does / why we need it?

• Add useRevisions section to react.mdx with signature, return values, and usage example
• Update revisions.mdx to recommend the built-in useRevisions hook, keeping the manual approach as an alternative
• Add react-revision example to the examples table

Any background context you want to provide?

What are the relevant tickets?

Fixes #

Checklist

• Added relevant tests or not required
• Didn't break anything

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch use-revisions

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