code: @Override
      public DescribeScheduledInstancesResult describeScheduledInstances(DescribeScheduledInstancesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeScheduledInstances(request);
      }
docs: <p>
  Describes the specified Scheduled Instances or all your Scheduled Instances.
  </p>
  
  @param describeScheduledInstancesRequest
  Contains the parameters for DescribeScheduledInstances.
  @return Result of the DescribeScheduledInstances operation returned by the service.
  @sample AmazonEC2.DescribeScheduledInstances
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeScheduledInstances" target="_top">AWS
  API Documentation</a>