code: public Content getEnumConstantsTreeHeader(FieldDoc enumConstant,
              Content enumConstantsDetailsTree) {
          enumConstantsDetailsTree.addContent(
                  writer.getMarkerAnchor(enumConstant.name()));
          Content enumConstantsTree = writer.getMemberTreeHeader();
          Content heading = new HtmlTree(HtmlConstants.MEMBER_HEADING);
          heading.addContent(enumConstant.name());
          enumConstantsTree.addContent(heading);
          return enumConstantsTree;
      }
docs: {@inheritDoc}