code: protected void addNavSummaryLink(List<?> members,
              VisibleMemberMap visibleMemberMap, Content liNav) {
          if (members.size() > 0) {
              liNav.addContent(getNavSummaryLink(null, true));
              return;
          }
          ClassDoc icd = classdoc.superclass();
          while (icd != null) {
              List<?> inhmembers = visibleMemberMap.getMembersFor(icd);
              if (inhmembers.size() > 0) {
                  liNav.addContent(getNavSummaryLink(icd, true));
                  return;
              }
              icd = icd.superclass();
          }
          liNav.addContent(getNavSummaryLink(null, false));
      }
docs: Add the navigation summary link.
  
  @param members members to be linked
  @param visibleMemberMap the visible inherited members map
  @param liNav the content tree to which the navigation summary link will be added