code: protected Content getNavDetailLinks() throws Exception {
          Content li = HtmlTree.LI(detailLabel);
          li.addContent(getSpace());
          Content ulNav = HtmlTree.UL(HtmlStyle.subNavList, li);
          MemberSummaryBuilder memberSummaryBuilder = (MemberSummaryBuilder)
                  configuration.getBuilderFactory().getMemberSummaryBuilder(this);
          AbstractMemberWriter writerField =
                  ((AbstractMemberWriter) memberSummaryBuilder.
                  getMemberSummaryWriter(VisibleMemberMap.ANNOTATION_TYPE_FIELDS));
          AbstractMemberWriter writerOptional =
                  ((AbstractMemberWriter) memberSummaryBuilder.
                  getMemberSummaryWriter(VisibleMemberMap.ANNOTATION_TYPE_MEMBER_OPTIONAL));
          AbstractMemberWriter writerRequired =
                  ((AbstractMemberWriter) memberSummaryBuilder.
                  getMemberSummaryWriter(VisibleMemberMap.ANNOTATION_TYPE_MEMBER_REQUIRED));
          Content liNavField = new HtmlTree(HtmlTag.LI);
          if (writerField != null){
              writerField.addNavDetailLink(annotationType.fields().length > 0, liNavField);
          } else {
              liNavField.addContent(getResource("doclet.navField"));
          }
          addNavGap(liNavField);
          ulNav.addContent(liNavField);
          if (writerOptional != null){
              Content liNavOpt = new HtmlTree(HtmlTag.LI);
              writerOptional.addNavDetailLink(annotationType.elements().length > 0, liNavOpt);
              ulNav.addContent(liNavOpt);
          } else if (writerRequired != null){
              Content liNavReq = new HtmlTree(HtmlTag.LI);
              writerRequired.addNavDetailLink(annotationType.elements().length > 0, liNavReq);
              ulNav.addContent(liNavReq);
          } else {
              Content liNav = HtmlTree.LI(getResource("doclet.navAnnotationTypeMember"));
              ulNav.addContent(liNav);
          }
          return ulNav;
      }
docs: Get detail links for the navigation bar.
  
  @return the content tree for the detail links