Theme JSON: backport PHP annotations from Core

[ramonjd]

What?

Just backporting PHP annotations from Core Theme JSON method for consistency.

See source: https://github.com/ramonjd/wordpress-develop/blob/ebc66bb9a13180d85f5a8b374d85ce14e0b7b2db/src/wp-includes/class-wp-theme-json.php#L2043-L2043

[github-actions]

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Co-authored-by: ramonjd <[email protected]>

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[github-actions]

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