Inline documentation for hooks in wp-includes/default-widgets.php.

Props janw.oostendorp and kpdesign.
Fixes #25638.


git-svn-id: https://develop.svn.wordpress.org/trunk@27697 602fd350-edb4-49c9-b593-d223f7449a82
Inline documentation for hooks in wp-includes/meta.php.

Props raamdev and kpdesign.
Fixes #25826.


git-svn-id: https://develop.svn.wordpress.org/trunk@27698 602fd350-edb4-49c9-b593-d223f7449a82
Inline documentation for hooks in wp-includes/revision.php.

Props adamsilverstein, DrewAPicture.
Fixes #26979.


git-svn-id: https://develop.svn.wordpress.org/trunk@27699 602fd350-edb4-49c9-b593-d223f7449a82