fix #67388 (update zend_extension directive description)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334916 c90b9560-bf6c-de11-be94-00142212c4b1
fix #67936 (change use of the word "stack" for "queue")

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334917 c90b9560-bf6c-de11-be94-00142212c4b1