docs: public DescribeGatewayInformationResult withGatewayNetworkInterfaces(NetworkInterface... gatewayNetworkInterfaces) {
          if (this.gatewayNetworkInterfaces == null) {
              setGatewayNetworkInterfaces(new com.amazonaws.internal.SdkInternalList<NetworkInterface>(gatewayNetworkInterfaces.length));
          }
          for (NetworkInterface ele : gatewayNetworkInterfaces) {
              this.gatewayNetworkInterfaces.add(ele);
          }
          return this;
      }