code: func (c *Callbacks) OnCDOTAUserMsg_TE_Projectile(fn func(*dota.CDOTAUserMsg_TE_Projectile) error) {
  	c.onCDOTAUserMsg_TE_Projectile = append(c.onCDOTAUserMsg_TE_Projectile, fn)
  }
docs: // OnCDOTAUserMsg_TE_Projectile registers a callback for EDotaUserMessages_DOTA_UM_TE_Projectile