Inline documentation for core shortcode attributes.

Props DrewAPicture, johnbillion.
Fixes #25661.

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Inline documentation for hooks in wp-admin/includes/class-wp-media-list-table.php.

Props theorboman for the initial patch. Props kpdesign.
Fixes #25839.

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Inline documentation for hooks in wp-admin/media-upload.php.

Props piontkowski for the initial patch.
Fixes #26075.

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

Props SpencerFinnell for the initial patch.
Fixes #26092.

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