code: @Override
      public DescribeDBParametersResult describeDBParameters(DescribeDBParametersRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeDBParameters(request);
      }
docs: <p>
  Returns the detailed parameter list for a particular DB parameter group.
  </p>
  
  @param describeDBParametersRequest
  @return Result of the DescribeDBParameters operation returned by the service.
  @throws DBParameterGroupNotFoundException
  <i>DBParameterGroupName</i> does not refer to an existing DB parameter group.
  @sample AmazonNeptune.DescribeDBParameters
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/DescribeDBParameters" target="_top">AWS
  API Documentation</a>