message: docs: add method doc
  PR Close
diff: @@ -190,6 +190,9 @@ export class NgForOf<T> implements DoCheck {
  }
  }
  + /**
  + * Applies the changes when needed.
  + */
  ngDoCheck(): void {
  if (this._ngForOfDirty) {
  this._ngForOfDirty = false;
  