code: protected Content getModuleLink(ModuleElement mdle) {
          Content moduleLinkContent;
          Content mdlLabel = new StringContent(mdle.getQualifiedName());
          moduleLinkContent = getModuleFramesHyperLink(mdle, mdlLabel, "packageListFrame");
          Content li = HtmlTree.LI(moduleLinkContent);
          return li;
      }
docs: Returns each module name as a separate link.
  
  @param mdle the module being documented
  @return content for the module link