Make login styles standalone. see #12506.

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Login styles do not depend on common.css. see #12506.

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Fixes for hooks documentation wp-includes/nav-menu-template.php.

See #26869, #25229 and [25410].

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Inline documentation for hooks in wp-admin/includes/image.php.

Props theorboman, kpdesign.
Fixes #25832.

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