Update the docstring

Author: rhettinger

Lib/queue.py

@@ -240,8 +240,8 @@ def shutdown(self, immediate=False):
         'immediate' to True to make gets raise immediately instead.
 
         All blocked callers of put() and get() will be unblocked. If
-        'immediate', a task is marked as done for each item remaining in
-        the queue, which may unblock callers of join().
+        'immediate', callers of join() are unblocked regardless of
+        the number of unfinished tasks.
         '''
         with self.mutex:
             self.is_shutdown = True