[ticket/12241] Add @var for the arguments

PHPBB3-12241

phpBB/includes/acp/acp_board.php

@@ -460,6 +460,9 @@ class acp_board
 		* Event to add and/or modify acp_board configurations
 		*
 		* @event core.acp_board_config_edit_add
+		* @var	array	display_vars	Array of config values to display and process
+		* @var	string	mode			Mode of the config page we are displaying
+		* @var	boolean	submit			Do we display the form or process the submission
 		* @since 3.1.0-a4
 		*/
 		$vars = array('display_vars', 'mode', 'submit');