docs(OverflowMenu): expose OverflowMenuContext in docs

[kmcfaul]

What: Closes #12421

Summary by CodeRabbit

• Documentation
  • Updated the Overflow Menu example documentation with additional guidance on using the Overflow Menu context to customize responsive, breakpoint-aware behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c77aca2f-bd55-42c5-a1d6-04828f01ff95

📥 Commits

Reviewing files that changed from the base of the PR and between cf5047a and f507f0b.

📒 Files selected for processing (1)

• packages/react-core/src/components/OverflowMenu/examples/OverflowMenu.md

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/react-core/src/components/OverflowMenu/examples/OverflowMenu.md

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Walkthrough

The OverflowMenu example documentation now describes importing OverflowMenuContext and its breakpoint-aware isBelowBreakpoint boolean.

Changes

OverflowMenu documentation

Layer / File(s)	Summary
Document OverflowMenuContext behavior packages/react-core/src/components/OverflowMenu/examples/OverflowMenu.md	The documentation explains importing OverflowMenuContext and the isBelowBreakpoint state associated with the configured breakpoint.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR only adds documentation and does not actually expose OverflowMenuContext in the public API, so #12421 is not satisfied.	Export OverflowMenuContext from the public API and update docs to describe the new import path and breakpoint behavior.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and matches the change, which documents OverflowMenuContext exposure.
Out of Scope Changes check	✅ Passed	The change is limited to OverflowMenu documentation and does not introduce unrelated code or scope creep.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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