Inline docs for hooks in `wp-admin/options-writing.php`. props siobhyb. see #25229.


git-svn-id: https://develop.svn.wordpress.org/trunk@25411 602fd350-edb4-49c9-b593-d223f7449a82
No space between // and duplicate_hook. see #25229


git-svn-id: https://develop.svn.wordpress.org/trunk@25412 602fd350-edb4-49c9-b593-d223f7449a82