Update beepTask comment to reflect task-notification wakeup mechanism

src/InterruptHandler.cpp

@@ -98,7 +98,7 @@ void InterruptHandler_PauseReceive()
 }
 
 /**
- * Woken every 10 ms by timerIsr via beepSemaphore.
+ * Woken every 10 ms by timerIsr via task notification.
  * Handles short-beep timing and the PiepPattern state machine,
  * then drives the buzzer supply pin — work that was previously in timerIsr.
  *