Clarify `submit_button()` `$type` parameter docs to mention that the value doubles as the CSS class attribute.

See #27070

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Improve inline documentation for `submit_button()`.

See #27070.

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Fix docs spacing missed in [27136].

See #27070.

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Inline documentation for the `wp_insert_attachment_data` filter hook, added in [27130].

Fixes #20547.

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Inline documentation tweaks for `has_image_size()` and `remove_image_size()`.

See #26951.

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