code: func (c *Callbacks) OnCNETMsg_SpawnGroup_Unload(fn func(*dota.CNETMsg_SpawnGroup_Unload) error) {
  	c.onCNETMsg_SpawnGroup_Unload = append(c.onCNETMsg_SpawnGroup_Unload, fn)
  }
docs: // OnCNETMsg_SpawnGroup_Unload registers a callback for NET_Messages_net_SpawnGroup_Unload