Move the xkcd comic to the top of the goto page, rather than the bottom.

Reasoning:

1. It's funny.
2. People seem to keep using goto[0] and need to be more aware of the
   velociraptor based threat they are exposed to.
3. It's funny.

[0] http://www.reddit.com/r/PHP/comments/1rw2fa/using_goto_in_php/


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332237 c90b9560-bf6c-de11-be94-00142212c4b1