code: def update(self, capacity=values.unset, available=values.unset):
          
          return self._proxy.update(capacity=capacity, available=available, )
docs: Update the WorkerChannelInstance
  
          :param unicode capacity: The total number of Tasks worker should handle for this TaskChannel type.
          :param bool available: Toggle the availability of the WorkerChannel.
  
          :returns: Updated WorkerChannelInstance
          :rtype: twilio.rest.taskrouter.v1.workspace.worker.worker_channel.WorkerChannelInstance