code: def update(self, initiation_actions=values.unset):
          
          data = values.of({'InitiationActions': serialize.object(initiation_actions), })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return AssistantInitiationActionsInstance(
              self._version,
              payload,
              assistant_sid=self._solution['assistant_sid'],
          )
docs: Update the AssistantInitiationActionsInstance
  
          :param dict initiation_actions: The initiation_actions
  
          :returns: Updated AssistantInitiationActionsInstance
          :rtype: twilio.rest.preview.understand.assistant.assistant_initiation_actions.AssistantInitiationActionsInstance