Fix doc build warning

Doc/library/ssl.rst

@@ -791,7 +791,9 @@ SSL sockets provide the following methods of :ref:`socket-objects`:
   the same limitation)
 - :meth:`~socket.socket.sendfile()` (but :mod:`os.sendfile` will be used
   for plain-text sockets only, else :meth:`~socket.socket.send()` will be used)
+
      .. versionadded:: 3.5
+
 - :meth:`~socket.socket.shutdown()`
 
 However, since the SSL (and TLS) protocol has its own framing atop