message: docs(mapTo): remove duplicated word in the example caption
diff: @@ -15,7 +15,7 @@ import { Observable } from '../Observable';
  * Observable emits a value. In other words, ignores the actual source value,
  * and simply uses the emission moment to know when to emit the given `value`.
  *
  - * @example <caption>Map every every click to the string 'Hi'</caption>
  + * @example <caption>Map every click to the string 'Hi'</caption>
  * var clicks = Rx.Observable.fromEvent(document, 'click');
  * var greetings = clicks.mapTo('Hi');
  * greetings.subscribe(x => console.log(x));
  