wp_register_custom_css_support: update PHP doc to clarify purpose#11725

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ramonjd wants to merge 1 commit intoWordPress:trunkfrom

ramonjd:update/wp_strip_custom_css_from_blocks-php-doc

Commits on May 6, 2026

Clarify the purpose of the `wp_register_custom_css_support` function by specifying that it strips custom CSS attributes from all blocks in post content.
ramonjd
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