docs: Capitalize 'Actions' in reference documentation

[vedparkasharya]

Summary

Capitalizes the React concept "Actions" in the reference documentation, per the style guide in #6713.

"Actions" is one of the remaining items from #6713 that was not yet completed.

Changes Made

• useActionState.md:

  • "queued actions" → "queued Actions"
  • "sync actions" → "sync Actions"
  • "async actions" → "async Actions"

• useTransition.md:

  • "<form> actions" → "<form> Actions"
  • "pending actions" → "pending Actions"

• form.md:

  • "submission actions" → "submission Actions"

Style Guide Compliance

• ✅ Capitalized when referring to the React Actions concept
• ✅ Kept lowercase for general programming terms
• ✅ Kept lowercase for parameter names (e.g., action in backticks)
• ✅ Did not modify blog or community pages
• ✅ Did not modify heading IDs like {/* usestate */}

Coverage

This PR covers all instances of lowercase "actions" in the three main reference docs that discuss React Actions. The changes are minimal and focused to ensure accurate capitalization of the React concept throughout.

Fixes #6713 (Actions item)

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