fix docstring in events.js

example shows registering a handler, not triggering an event.

IPython/html/static/base/js/events.js

@@ -1,23 +1,24
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 // Give us an object to bind all events to. This object should be created
 // before all other objects so it exists when others register event handlers.
-// To trigger an event handler:
+// To register an event handler:
+//
 // require(['base/js/events'], function (events) {
-//     events.on("event.Namespace", function () {do_stuff(); });
-// })
+//     events.on("event.Namespace", function () { do_stuff(); });
+// });
 
 define(['base/js/namespace', 'jquery'], function(IPython, $) {
     "use strict";
 
     var Events = function () {};
     
     var events = new Events();
     
     // Backwards compatability.
     IPython.Events = Events;
     IPython.events = events;
     
     return $([events]);
 });