code: public Content getModuleLink(ModuleElement mdle, Content label) {
          boolean included = utils.isIncluded(mdle);
          return (included)
                  ? getHyperLink(pathToRoot.resolve(DocPaths.moduleSummary(mdle)), label, "", "")
                  : label;
      }
docs: Get Module link.
  
  @param mdle the module being documented
  @param label tag for the link
  @return a content for the module link