code: func (api *API) DisableRailgun(railgunID string) (Railgun, error) {
  	return api.enableRailgun(railgunID, false)
  }
docs: // DisableRailgun enables a Railgun for all zones connected to it.
  //
  // API reference: https://api.cloudflare.com/#railgun-enable-or-disable-a-railgun