Add versionchanged in create_datagram_endpoint doc (GH-4697)

Most of the parameters were added in 3.4.4 (b9bf913a), but this
change was not documented
(cherry picked from commit 0ded5804)
Co-authored-by: Romuald Brunet <romuald@chivil.com>

Doc/library/asyncio-eventloop.rst

@@ -393,6 +393,9 @@ Creating connections
    See :ref:`UDP echo client protocol <asyncio-udp-echo-client-protocol>` and
    :ref:`UDP echo server protocol <asyncio-udp-echo-server-protocol>` examples.
 
+   .. versionchanged:: 3.4.4
+      The *family*, *proto*, *flags*, *reuse_address*, *reuse_port,
+      *allow_broadcast*, and *sock* parameters were added.
 
 .. coroutinemethod:: AbstractEventLoop.create_unix_connection(protocol_factory, path=None, \*, ssl=None, sock=None, server_hostname=None, ssl_handshake_timeout=None)