message: docs(windowCount): fix examples
diff: @@ -26,13 +26,13 @@ import { OperatorFunction } from '../types';
  * Ignore every 3rd click event, starting from the first one
  * ```javascript
  * import { fromEvent } from 'rxjs';
  - * import { windowCount, map, mergeAll } from 'rxjs/operators';
  + * import { windowCount, map, mergeAll, skip } from 'rxjs/operators';
  *
  * const clicks = fromEvent(document, 'click');
  * const result = clicks.pipe(
  - * windowCount(3)),
  - * map(win => win.skip(1)), // skip first of every 3 clicks
  - * mergeAll(), // flatten the Observable-of-Observables
  + * windowCount(3),
  + * map(win => win.pipe(skip(1))), // skip first of every 3 clicks
  + * mergeAll() // flatten the Observable-of-Observables
  * );
  * result.subscribe(x => console.log(x));
  * ```
  