code: public Content getDocLink(LinkInfoImpl.Kind context, MemberDoc doc, String label) {
          return getDocLink(context, doc.containingClass(), doc,
                  new StringContent(label));
      }
docs: Get the link for the given member.
  
  @param context the id of the context where the link will be added
  @param doc the member being linked to
  @param label the label for the link
  @return a content tree for the doc link