Docs: update incorrect Settings examples in "Global Settings & Styles"

[chthonic-ds]

Description

The Settings examples provided for:

• "Disable border radius for the button block"
• "Provide the group block a different palette than the rest"

...are incorrect due to a "blocks" property name missing from the hierarchy.

This change adds the missing "blocks" property name for each example.

How has this been tested?

Screenshots

Types of changes

Documentation

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).

[github-actions]

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[oandregal]

Thanks for the fix!