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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[github-actions]

Flaky tests detected in 4f37db2.
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/12722075332
📝 Reported issues:

• [Flaky Test] Redirection after template creation #60678 in /test/e2e/specs/site-editor/site-editor-url-navigation.spec.js