docs: @BetaApi
    public final Operation deleteTargetVpnGateway(
        ProjectRegionTargetVpnGatewayName targetVpnGateway) {
  
      DeleteTargetVpnGatewayHttpRequest request =
          DeleteTargetVpnGatewayHttpRequest.newBuilder()
              .setTargetVpnGateway(targetVpnGateway == null ? null : targetVpnGateway.toString())
              .build();
      return deleteTargetVpnGateway(request);
    }