etc/kamailio.cfg: updated comment when blocking 401/407 from downstream

etc/kamailio.cfg

@@ -1092,7 +1092,7 @@ failure_route[MANAGE_FAILURE] {
 #!endif
 
 #!ifdef WITH_BLOCK401407
-	# block call redirect based on 401, 407 replies.
+	# block downstream auth based on 401, 407 replies.
 	if (t_check_status("401|407")) {
 		t_reply("404", "Not found");
 		exit;