code: protected void addNavSummaryLink(MemberSummaryBuilder builder,
              String label, int type, Content liNav) {
          AbstractMemberWriter writer = ((AbstractMemberWriter) builder.
                  getMemberSummaryWriter(type));
          if (writer == null) {
              liNav.addContent(getResource(label));
          } else {
              liNav.addContent(writer.getNavSummaryLink(null,
                      ! builder.getVisibleMemberMap(type).noVisibleMembers()));
          }
      }
docs: Add the navigation summary link.
  
  @param builder builder for the member to be documented
  @param label the label for the navigation
  @param type type to be documented
  @param liNav the content tree to which the navigation summary link will be added