Move LDAP to its own section

Author: Scott MacVicar

UPGRADING

@@ -357,12 +357,14 @@ UPGRADE NOTES - PHP X.Y
        - Core:
          - get_declared_traits()
          - http_response_code()
-         - ldap_control_paged_results()
-         - ldap_control_paged_results_response()
          - trait_exists()
          - stream_set_chunk_size()
          - socket_import_stream()
 
+       - LDAP:
+         - ldap_control_paged_results()
+         - ldap_control_paged_results_response()
+
      f. New global constants
 
        - JSON_PRETTY_PRINT