code: @Override
      public DescribeTransitGatewaysResult describeTransitGateways(DescribeTransitGatewaysRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeTransitGateways(request);
      }
docs: <p>
  Describes one or more transit gateways. By default, all transit gateways are described. Alternatively, you can
  filter the results.
  </p>
  
  @param describeTransitGatewaysRequest
  @return Result of the DescribeTransitGateways operation returned by the service.
  @sample AmazonEC2.DescribeTransitGateways
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeTransitGateways" target="_top">AWS
  API Documentation</a>