Added Global Documentation in inline documentation

[shail-mehta]

Added Missing Global Documentation in lib/demo.php and bin/generate-gutenberg-php.php files

[github-actions]

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

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[github-actions]

Flaky tests detected in 5afe993.
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/12730355191
📝 Reported issues:

• [Flaky Test] Navigates from items list to preview via TAB, and vice versa #62434 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js
• [Flaky Test] Redirection after template creation #60678 in /test/e2e/specs/site-editor/site-editor-url-navigation.spec.js
• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js