minor docu fixes

html/safechat.js

@@ -135,8 +135,7 @@ function getLoopStop() {
 }
 
 /// Alert user
-/** Alert user, e.g. that a new message has arrived.
-    @param  */
+/** Alert user, e.g. that a new message has arrived. */
 function alert() {
     navigator.vibrate =
         navigator.vibrate || navigator.webkitVibrate || navigator.mozVibrate || navigator.msVibrate;