message: Update operators.md
  Add a missing word in the code comment.
diff: @@ -320,7 +320,7 @@ function delay<T>(delayInMillis: number) {
  },
  complete() {
  hasCompleted = true;
  - // If we still have timers running, we don't want to yet.
  + // If we still have timers running, we don't want to complete yet.
  if (allTimerIDs.size === 0) {
  subscriber.complete();
  }
  