code: @Override
      public DescribeOrderableDBInstanceOptionsResult describeOrderableDBInstanceOptions(DescribeOrderableDBInstanceOptionsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeOrderableDBInstanceOptions(request);
      }
docs: <p>
  Returns a list of orderable DB instance options for the specified engine.
  </p>
  
  @param describeOrderableDBInstanceOptionsRequest
  @return Result of the DescribeOrderableDBInstanceOptions operation returned by the service.
  @sample AmazonNeptune.DescribeOrderableDBInstanceOptions
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/DescribeOrderableDBInstanceOptions"
  target="_top">AWS API Documentation</a>