Fixes for hooks documentation wp-includes/nav-menu-template.php.

See #26869, #25229 and [25410].

Built from https://develop.svn.wordpress.org/trunk@27201


git-svn-id: http://core.svn.wordpress.org/trunk@27058 1a063a9b-81f0-0310-95a4-ce76da25c4cd