Remove print race from task_done example. (GH-31795)

(cherry picked from commit a0eb69c)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>

Doc/library/queue.rst

@@ -201,15 +201,14 @@ Example of how to wait for enqueued tasks to be completed::
             print(f'Finished {item}')
             q.task_done()
 
-    # turn-on the worker thread
+    # Turn-on the worker thread.
     threading.Thread(target=worker, daemon=True).start()
 
-    # send thirty task requests to the worker
+    # Send thirty task requests to the worker.
     for item in range(30):
         q.put(item)
-    print('All task requests sent\n', end='')
 
-    # block until all tasks are done
+    # Block until all tasks are done.
     q.join()
     print('All work completed')