Note the version .ogg/.ogv/.webm were added in. 
Mention new .pdf MIME type. 
Update the unsupported MIME type example to use a MIME type that doesn't exist.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331968 c90b9560-bf6c-de11-be94-00142212c4b1