code: func (c *Callbacks) OnCNETMsg_SpawnGroup_ManifestUpdate(fn func(*dota.CNETMsg_SpawnGroup_ManifestUpdate) error) {
  	c.onCNETMsg_SpawnGroup_ManifestUpdate = append(c.onCNETMsg_SpawnGroup_ManifestUpdate, fn)
  }
docs: // OnCNETMsg_SpawnGroup_ManifestUpdate registers a callback for NET_Messages_net_SpawnGroup_ManifestUpdate