Added Missing Global Documentation

[shail-mehta]

What?

Added @global documentation in lib/experimental/navigation-theme-opt-in.php file

Why?

@global documentation is missing in lib/experimental/navigation-theme-opt-in.php file

How?

Testing Instructions

1. Open lib/experimental/navigation-theme-opt-in.php file
2. See @global documentation is missing

[github-actions]

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Co-authored-by: shail-mehta <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[github-actions]

Flaky tests detected in 7d4c08f.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/13212895796
📝 Reported issues:

• [Flaky Test] save flow should allow re-saving after changing the same block attribute #69019 in /test/e2e/specs/site-editor/multi-entity-saving.spec.js

[t-hamano]

👍

[shail-mehta]

Thank you for the review