clarify multiprocessing.Queue close()

Author: saggarwal145

Doc/library/multiprocessing.rst

@@ -936,8 +936,13 @@ For an example of the usage of queues for interprocess communication see
 
    .. method:: close()
 
-      Indicate that no more data will be put on this queue by the current
-      process.  The background thread will quit once it has flushed all buffered
+      Close the queue: release internal resources.
+
+      A queue must not be used anymore after it is closed. For example,
+      :meth:`get`, :meth:`put` and :meth:`empty` methods must no longer be
+      called.
+
+      The background thread will quit once it has flushed all buffered
       data to the pipe.  This is called automatically when the queue is garbage
       collected.