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

props natejacobs.
see #25229.
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Inline documentation for hooks in wp-admin/ms-delete-site.php.

props NikV.
see #25229.
Built from https://develop.svn.wordpress.org/trunk@25424


git-svn-id: http://core.svn.wordpress.org/trunk@25349 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a PHP warning in network admin if a constant corresponding to a drop-in is not defined. fixes #25301.
Built from https://develop.svn.wordpress.org/trunk@25425


git-svn-id: http://core.svn.wordpress.org/trunk@25350 1a063a9b-81f0-0310-95a4-ce76da25c4cd