code: protected GSONWorkUnit createGSONWorkUnit(
              final DocWorkUnit workUnit,
              final List<Map<String, String>> indexByGroupMaps,
              final List<Map<String, String>> featureMaps)
      {
          return new GSONWorkUnit();
      }
docs: Doclet implementations (subclasses) should return a GSONWorkUnit-derived object if the GSON objects
  for the DocumentedFeature needs to contain custom values.
  @return a GSONWorkUnit-derived object