docs: add docstring back:

Author: nachatz

pulsar/asyncio.py

@@ -324,6 +324,19 @@ async def negative_acknowledge(
         self,
         message: Union[pulsar.Message, pulsar.MessageId, _pulsar.Message, _pulsar.MessageId]
     ) -> None:
+        """
+        Acknowledge the failure to process a single message asynchronously.
+
+        When a message is "negatively acked" it will be marked for redelivery after
+        some fixed delay. The delay is configurable when constructing the consumer
+        with {@link ConsumerConfiguration#setNegativeAckRedeliveryDelayMs}.
+        This call is not blocking.
+        
+        Parameters
+        ----------
+        message:
+            The received message or message id.
+        """
         if isinstance(message, pulsar.Message):
             msg = message._message
         elif isinstance(message, pulsar.MessageId):