code: protected void addPackageUse(PackageElement pkg, Content contentTree) {
          Content thFirst = HtmlTree.TH_ROW_SCOPE(HtmlStyle.colFirst,
                  getHyperLink(getPackageAnchorName(pkg), new StringContent(utils.getPackageName(pkg))));
          contentTree.addContent(thFirst);
          HtmlTree tdLast = new HtmlTree(HtmlTag.TD);
          tdLast.addStyle(HtmlStyle.colLast);
          addSummaryComment(pkg, tdLast);
          contentTree.addContent(tdLast);
      }
docs: Add the package use information.
  
  @param pkg the package that uses the given class
  @param contentTree the content tree to which the package use information will be added