Inline docs for hooks in `wp-includes/nav-menu-template.php`. props Faison. see #25229.

Built from https://develop.svn.wordpress.org/trunk@25410


git-svn-id: http://core.svn.wordpress.org/trunk@25336 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline docs for hooks in `wp-admin/options-writing.php`. props siobhyb. see #25229.

Built from https://develop.svn.wordpress.org/trunk@25411


git-svn-id: http://core.svn.wordpress.org/trunk@25337 1a063a9b-81f0-0310-95a4-ce76da25c4cd
No space between // and duplicate_hook. see #25229

Built from https://develop.svn.wordpress.org/trunk@25412


git-svn-id: http://core.svn.wordpress.org/trunk@25338 1a063a9b-81f0-0310-95a4-ce76da25c4cd