Updating documentation for scheduleActual method (#7164)

Author: Archish27

src/main/java/io/reactivex/rxjava3/internal/schedulers/NewThreadWorker.java

@@ -116,10 +116,8 @@ public Disposable schedulePeriodicallyDirect(Runnable run, long initialDelay, lo
     }
 
     /**
-     * Wraps the given runnable into a ScheduledRunnable and schedules it
+     * Wraps and returns the given runnable into a ScheduledRunnable and schedules it
      * on the underlying ScheduledExecutorService.
-     * <p>If the schedule has been rejected, the ScheduledRunnable.wasScheduled will return
-     * false.
      * @param run the runnable instance
      * @param delayTime the time to delay the execution
      * @param unit the time unit