Docs async react hooks

[adi-rajput]

Description:

Update the Hooks reference page to introduce a new Async React Hooks section.

This groups together async-related hooks to better reflect React 19 patterns around Actions and improve discoverability of related APIs.

Changes:

• Add a new Async React Hooks section on the Hooks reference page
• Group useTransition, useActionState, and useOptimistic under this section
• Remove useActionState from the Other Hooks section to avoid duplication
• Follow the existing hooks index format using bullet links and short descriptions

Related issue(s):

Fixes #8316

Notes for reviewer:

The change is localized to the Hooks reference page and follows the existing documentation structure.
No hook behavior or API documentation was modified—only the organization of the hooks index page.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

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[github-actions]

Size changes

Details

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