chore: change the comment

Author: Fly-Playgroud

broadcaster/_backends/redis.py

@@ -55,7 +55,7 @@ async def _pubsub_listener(self) -> None:
 
             # when no channel subscribed, clear the event.
             # And then in next loop, event will blocked again until
-            # the new channel subscribed.Now asyncio.Task exited again.
+            # the new channel subscribed.Now asyncio.Task will not exit again.
             self._ready.clear()