Added Global Documentation in load.php

[shail-mehta]

Added Missing Global Documentation in lib/experimental/media/load.php file.

Testing Instructions

• Open lib/experimental/media/load.php file
• See global documentation is missing.

[github-actions]

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Co-authored-by: shail-mehta <shailu25@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

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[github-actions]

Flaky tests detected in fbe6e15.
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/12506558953
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js

[t-hamano]

Good catch!

[shail-mehta]

Thank you for the review.