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