Inline documentation for hooks in wp-includes/ms-load.php.

Props nukaga, johnbillion.
Fixes #25509.

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Inline documentation for hooks in wp-includes/class-feed.php.

Props swissspidy.
Fixes #25510.

Built from https://develop.svn.wordpress.org/trunk@25733


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Inline documentation for hooks in wp-admin/widgets.php.

Props r3df, kpdesign.
Fixes #25501.

Built from https://develop.svn.wordpress.org/trunk@25734


git-svn-id: http://core.svn.wordpress.org/trunk@25647 1a063a9b-81f0-0310-95a4-ce76da25c4cd