Inline documentation for hooks in wp-includes/comment.php.

comment.php, a.k.a. "lots 'o hooks".

Props swissspidy for the initial patch. Props danieldudzic, kpdesign, and DrewAPicture.
Fixes #25522.

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Correct @since values. see #25522.
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Inline documentation for hooks in wp-admin/user-new.php & wp-admin/user-edit.php.

Also fixes one parameter type in wp-includes/user.php.

Fixes #25726.

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Rotate the Collapse arrows correctly for RTL, switch the Theme next/previous arrows in RTL. Fixes #26340

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Prefix the new Theme classes. Fixes #25966

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Themes: For small screen sizes, still allow access to the Customize button (Don't hide the theme actions). See #25948

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Add the proper padding-top for button's active states in small screens. Fixes #26346

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Themes: In the detailed view, disable the next/previous buttons when there are no more items. Fixes #26314

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