message: docs(do): remove duplicated word in the example caption
diff: @@ -32,7 +32,7 @@ export function _do<T>(this: Observable<T>, observer: PartialObserver<T>): Obser
  * Observer will never happen. `do` therefore simply spies on existing
  * execution, it does not trigger an execution to happen like `subscribe` does.
  *
  - * @example <caption>Map every every click to the clientX position of that click, while also logging the click event</caption>
  + * @example <caption>Map every click to the clientX position of that click, while also logging the click event</caption>
  * var clicks = Rx.Observable.fromEvent(document, 'click');
  * var positions = clicks
  * .do(ev => console.log(ev))
  