bpo-36074: Result of asyncio.Server.sockets after Server.close() after is not clear (GH-11987)

[bpo-36074](https://bugs.python.org/issue36074): It becomes clear on  that the None is still return for server closed.





https://bugs.python.org/issue36074

Author: eamanu

Doc/library/asyncio-eventloop.rst

@@ -1394,8 +1394,7 @@ Do not instantiate the class directly.
 
    .. attribute:: sockets
 
-      List of :class:`socket.socket` objects the server is listening on,
-      or ``None`` if the server is closed.
+      List of :class:`socket.socket` objects the server is listening on.
 
       .. versionchanged:: 3.7
          Prior to Python 3.7 ``Server.sockets`` used to return an