docs: public ServiceFuture<P2SVpnGatewayInner> createOrUpdateAsync(String resourceGroupName, String gatewayName, P2SVpnGatewayInner p2SVpnGatewayParameters, final ServiceCallback<P2SVpnGatewayInner> serviceCallback) {
          return ServiceFuture.fromResponse(createOrUpdateWithServiceResponseAsync(resourceGroupName, gatewayName, p2SVpnGatewayParameters), serviceCallback);
      }