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

Props JoshuaAbenazer.
Fixes #26186

Built from https://develop.svn.wordpress.org/trunk@27375


git-svn-id: http://core.svn.wordpress.org/trunk@27224 1a063a9b-81f0-0310-95a4-ce76da25c4cd