code: func (c *Callbacks) OnCDOTAUserMsg_OverheadEvent(fn func(*dota.CDOTAUserMsg_OverheadEvent) error) {
  	c.onCDOTAUserMsg_OverheadEvent = append(c.onCDOTAUserMsg_OverheadEvent, fn)
  }
docs: // OnCDOTAUserMsg_OverheadEvent registers a callback for EDotaUserMessages_DOTA_UM_OverheadEvent