app_queue.c : fix "queue add member" usage string

Fixing bracket placement in the "queue add member" cli usage string.

apps/app_queue.c

@@ -10988,7 +10988,7 @@ static char *handle_queue_add_member(struct ast_cli_entry *e, int cmd, struct as
 	case CLI_INIT:
 		e->command = "queue add member";
 		e->usage =
-			"Usage: queue add member <dial string> to <queue> [[[penalty <penalty>] as <membername>] state_interface <interface>]\n"
+			"Usage: queue add member <dial string> to <queue> [penalty <penalty> [as <membername> [state_interface <interface>]]]\n"
 			"       Add a dial string (Such as a channel,e.g. SIP/6001) to a queue with optionally:  a penalty, membername and a state_interface\n";
 		return NULL;
 	case CLI_GENERATE: