code: protected void addDescription(MemberDoc member, Content dlTree) {
          String name = (member instanceof ExecutableMemberDoc)?
              member.name() + ((ExecutableMemberDoc)member).flatSignature() :
              member.name();
          Content span = HtmlTree.SPAN(HtmlStyle.memberNameLink,
                  getDocLink(LinkInfoImpl.Kind.INDEX, member, name));
          Content dt = HtmlTree.DT(span);
          dt.addContent(" - ");
          addMemberDesc(member, dt);
          dlTree.addContent(dt);
          Content dd = new HtmlTree(HtmlTag.DD);
          addComment(member, dd);
          dlTree.addContent(dd);
      }
docs: Add description for Class, Field, Method or Constructor.
  
  @param member MemberDoc for the member of the Class Kind
  @param dlTree the content tree to which the description will be added