code: func (c *Callbacks) OnCNETMsg_SpawnGroup_Load(fn func(*dota.CNETMsg_SpawnGroup_Load) error) {
  	c.onCNETMsg_SpawnGroup_Load = append(c.onCNETMsg_SpawnGroup_Load, fn)
  }
docs: // OnCNETMsg_SpawnGroup_Load registers a callback for NET_Messages_net_SpawnGroup_Load