Plupload: remove the (old) plupload.silverlight.xap, remove the "executable" prop from Moxie.xap, see #25663
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Inline documentation for hooks in wp-includes/rewrite.php.

Props mboynes for the initial patch.
Fixes #26095.

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git-svn-id: http://core.svn.wordpress.org/trunk@27193 1a063a9b-81f0-0310-95a4-ce76da25c4cd