code: @Override
      public DescribeReservedDBInstancesResult describeReservedDBInstances(DescribeReservedDBInstancesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeReservedDBInstances(request);
      }
docs: <p>
  Returns information about reserved DB instances for this account, or about a specified reserved DB instance.
  </p>
  
  @param describeReservedDBInstancesRequest
  @return Result of the DescribeReservedDBInstances operation returned by the service.
  @throws ReservedDBInstanceNotFoundException
  The specified reserved DB Instance not found.
  @sample AmazonRDS.DescribeReservedDBInstances
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/DescribeReservedDBInstances"
  target="_top">AWS API Documentation</a>