code: def update(self, friendly_name):
          
          data = values.of({'FriendlyName': friendly_name, })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return FunctionInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              sid=self._solution['sid'],
          )
docs: Update the FunctionInstance
  
          :param unicode friendly_name: The friendly_name
  
          :returns: Updated FunctionInstance
          :rtype: twilio.rest.serverless.v1.service.function.FunctionInstance