Better visual alignment on side-sortables tabs. Fixes #26323, props mattheu.
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Inline documentation for hooks in wp-admin/includes/update.php.

Props stevenkword for the initial patches.
Fixes #26252.

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Remove @uses from get_screen_icon() / screen_icon(). see #26119.

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git-svn-id: http://core.svn.wordpress.org/trunk@26433 1a063a9b-81f0-0310-95a4-ce76da25c4cd