code: @Override
      public DescribeReservedInstancesResult describeReservedInstances(DescribeReservedInstancesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeReservedInstances(request);
      }
docs: <p>
  Describes one or more of the Reserved Instances that you purchased.
  </p>
  <p>
  For more information about Reserved Instances, see <a
  href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/concepts-on-demand-reserved-instances.html">Reserved
  Instances</a> in the <i>Amazon Elastic Compute Cloud User Guide</i>.
  </p>
  
  @param describeReservedInstancesRequest
  Contains the parameters for DescribeReservedInstances.
  @return Result of the DescribeReservedInstances operation returned by the service.
  @sample AmazonEC2.DescribeReservedInstances
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeReservedInstances" target="_top">AWS
  API Documentation</a>