docs: update docstrings for sphinx conformity

Remove most references to timeout/callback/ifrom/timeout_callbacks args

slixmpp/plugins/xep_0084/avatar.py

@@ -92,14 +92,6 @@ class XEP_0084(BasePlugin):
     def stop(self, ifrom=None, callback=None, timeout=None, timeout_callback=None):
         """
         Clear existing avatar metadata information to stop notifications.
-
-        Arguments:
-            ifrom    -- Specify the sender's JID.
-            timeout  -- The length of time (in seconds) to wait for a response
-                        before exiting the send call if blocking is used.
-                        Defaults to slixmpp.xmlstream.RESPONSE_TIMEOUT
-            callback -- Optional reference to a stream handler function. Will
-                        be executed when a reply stanza is received.
         """
         metadata = MetaData()
         return self.xmpp['xep_0163'].publish(metadata,