message: docs(operators): add missing import to the example
  * docs(operators): add missing import to the example
  mergeScan import was missing in the example so it did not work
  * docs(example): comment out expected result
diff: @@ -19,7 +19,7 @@ import { ObservableInput, OperatorFunction } from '../types';
  * Count the number of click events
  * ```javascript
  * import { fromEvent, of } from 'rxjs';
  - * import { mapTo } from 'rxjs/operators';
  + * import { mapTo, mergeScan } from 'rxjs/operators';
  *
  * const click$ = fromEvent(document, 'click');
  * const one$ = click$.pipe(mapTo(1));
  @@ -30,10 +30,10 @@ import { ObservableInput, OperatorFunction } from '../types';
  * count$.subscribe(x => console.log(x));
  *
  * // Results:
  - * 1
  - * 2
  - * 3
  - * 4
  + * // 1
  + * // 2
  + * // 3
  + * // 4
  * // ...and so on for each click
  * ```
  *
  