Removed the deprecated directive

Author: javiereguiluz

security/ldap.rst

@@ -527,11 +527,6 @@ Configuration example for form login and query_string
             ]
         ]);
 
-.. deprecated:: 4.4
-
-    Using the ``query_string`` config option without defining ``search_dn`` and
-    ``search_password`` is deprecated since Symfony 4.4.
-
 .. _`LDAP PHP extension`: http://www.php.net/manual/en/intro.ldap.php
 .. _`RFC4515`: http://www.faqs.org/rfcs/rfc4515.html
 .. _`LDAP injection`: http://projects.webappsec.org/w/page/13246947/LDAP%20Injection