[Documentation]: Fix hyperlink in block Metadata page

[sanzeeb3]

Description

Fixes #38940.

Capital letters make incorrect links.

In the documentation: https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/

Script #Script
Type: WPDefinedAsset (learn more)
Optional
Localized: No
Property: script

Clicking n learn more leads to nowhere because of capital letters in hyperlinks.

Testing Instructions

1. Go to https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/
2. Click on learn more as stated above.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
• I've updated related schemas if appropriate.

[github-actions]

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[ntsekouras]

Thanks for the PR @sanzeeb3!

Can you please update the remain similar references? They are five in total as I could see.

[ntsekouras]

Thank you for the contribution @sanzeeb3 🎉

[gziolo]

Thank you for the improvement 👍🏻