Typo in docs

The class name should be 'Events' instead of 'Event'

ionic/util/events.ts

@@ -8,7 +8,7 @@
  * ```ts
  * import {Events} from 'ionic-angular';
  * 
- * constructor(public events: Event) {}
+ * constructor(public events: Events) {}
  * 
  * // first page (publish an event when a user is created)
  * function createUser(user) {