Update an existing dampening definition.

        Note that the trigger mode can not be changed using this method.
        :param trigger_id: Trigger definition id targeted for update.
        :param dampening_id: Dampening definition id to be updated.
        :return: Updated Dampening

def update_dampening(self, trigger_id, dampening_id):
        """
        Update an existing dampening definition.

        Note that the trigger mode can not be changed using this method.
        :param trigger_id: Trigger definition id targeted for update.
        :param dampening_id: Dampening definition id to be updated.
        :return: Updated Dampening
        """
        data = self._serialize_object(dampening)
        url = self._service_url(['triggers', trigger_id, 'dampenings', dampening_id])
        return Dampening(self._put(url, data))