Fix wrapper usage title

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330316 c90b9560-bf6c-de11-be94-00142212c4b1
Document compression wrappers usage

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330317 c90b9560-bf6c-de11-be94-00142212c4b1
Fix a typo

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330318 c90b9560-bf6c-de11-be94-00142212c4b1