message: docs(observeOn): update observeOn Docu, missing import
diff: @@ -34,9 +34,10 @@ import { MonoTypeOperatorFunction, PartialObserver, SchedulerAction, SchedulerLi
  * ## Example
  * Ensure values in subscribe are called just before browser repaint.
  * ```ts
  - * import { interval } from 'rxjs';
  + * import { interval, animationFrameScheduler } from 'rxjs';
  * import { observeOn } from 'rxjs/operators';
  *
  + * const someDiv = document.querySelector("#someDiv");
  * const intervals = interval(10); // Intervals are scheduled
  * // with async scheduler by default...
  * intervals.pipe(
  