Fix the return value description for tidy::body(), and remove the long-obviated
warning about libtidy not implementing it (I checked; it does).

Fixes doc bug #65794 (wrong Return Values description).


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331631 c90b9560-bf6c-de11-be94-00142212c4b1