new directory for new class

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332925 c90b9560-bf6c-de11-be94-00142212c4b1
add new docs for pool

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332926 c90b9560-bf6c-de11-be94-00142212c4b1