code: def update(self, is_reserved=values.unset):
          
          return self._proxy.update(is_reserved=is_reserved, )
docs: Update the ShortCodeInstance
  
          :param bool is_reserved: Whether the short code should be reserved for manual assignment to participants only
  
          :returns: Updated ShortCodeInstance
          :rtype: twilio.rest.proxy.v1.service.short_code.ShortCodeInstance