add a comment about why hashes are being stubbed

www/pad/main.js

@@ -45,6 +45,11 @@ define([
     };
 
     var andThen = function (Ckeditor) {
+        /*  This is turned off because we prefer that the channel name
+            be chosen by the server, not generated by the client.
+
+            We still need a key, so we use genKey()
+        */
         // $(window).on('hashchange', function() {
             // window.location.reload();
         // });