code: public void addPreQualifiedClassLink(LinkInfoImpl.Kind context,
              ClassDoc cd, boolean isStrong, Content contentTree) {
          PackageDoc pd = cd.containingPackage();
          if(pd != null && ! configuration.shouldExcludeQualifier(pd.name())) {
              contentTree.addContent(getPkgName(cd));
          }
          contentTree.addContent(getLink(new LinkInfoImpl(configuration,
                  context, cd).label(cd.name()).strong(isStrong)));
      }
docs: Add the class link with the package portion of the label in
  plain text. If the qualifier is excluded, it will not be included in the
  link label.
  
  @param context the id of the context where the link will be added
  @param cd the class to link to
  @param isStrong true if the link should be strong
  @param contentTree the content tree to which the link with be added