Inline documentation for hooks in wp-includes/comment.php.

comment.php, a.k.a. "lots 'o hooks".

Props swissspidy for the initial patch. Props danieldudzic, kpdesign, and DrewAPicture.
Fixes #25522.

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git-svn-id: http://core.svn.wordpress.org/trunk@26385 1a063a9b-81f0-0310-95a4-ce76da25c4cd