WP_Query: `post_parent__in` and `post_parent__not_in`. props wonderboymusic. fixes #11056.



git-svn-id: http://core.svn.wordpress.org/trunk@23436 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add missing inline descriptions. see #19067.

git-svn-id: http://core.svn.wordpress.org/trunk@23437 1a063a9b-81f0-0310-95a4-ce76da25c4cd