Update task_done docstrings

Author: rhettinger

Lib/asyncio/queues.py

@@ -227,9 +227,6 @@ def task_done(self):
         been processed (meaning that a task_done() call was received for every
         item that had been put() into the queue).
 
-        shutdown(immediate=True) calls task_done() for each remaining item in
-        the queue.
-
         Raises ValueError if called more times than there were items placed in
         the queue.
         """

Lib/queue.py

@@ -80,9 +80,6 @@ def task_done(self):
         have been processed (meaning that a task_done() call was received
         for every item that had been put() into the queue).
 
-        shutdown(immediate=True) calls task_done() for each remaining item in
-        the queue.
-
         Raises a ValueError if called more times than there were items
         placed in the queue.
         '''