code: @Override
      public DescribeVpnGatewaysResult describeVpnGateways(DescribeVpnGatewaysRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeVpnGateways(request);
      }
docs: <p>
  Describes one or more of your virtual private gateways.
  </p>
  <p>
  For more information, see <a href="https://docs.aws.amazon.com/vpn/latest/s2svpn/VPC_VPN.html">AWS Site-to-Site
  VPN</a> in the <i>AWS Site-to-Site VPN User Guide</i>.
  </p>
  
  @param describeVpnGatewaysRequest
  Contains the parameters for DescribeVpnGateways.
  @return Result of the DescribeVpnGateways operation returned by the service.
  @sample AmazonEC2.DescribeVpnGateways
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeVpnGateways" target="_top">AWS API
  Documentation</a>