code: @Override
      protected Content getNavSummaryLink(TypeElement typeElement, boolean link) {
          if (link) {
              if (typeElement == null) {
                  return writer.getHyperLink(SectionName.ENUM_CONSTANT_SUMMARY,
                          contents.navEnum);
              } else {
                  return writer.getHyperLink(
                          SectionName.ENUM_CONSTANTS_INHERITANCE,
                          configuration.getClassName(typeElement), contents.navEnum);
              }
          } else {
              return contents.navEnum;
          }
      }
docs: {@inheritDoc}