code: protected void addReturnType(MethodDoc method, Content htmltree) {
          Type type = method.returnType();
          if (type != null) {
              Content linkContent = writer.getLink(
                      new LinkInfoImpl(configuration, LinkInfoImpl.Kind.RETURN_TYPE, type));
              htmltree.addContent(linkContent);
              htmltree.addContent(writer.getSpace());
          }
      }
docs: Add the return type.
  
  @param method the method being documented.
  @param htmltree the content tree to which the return type will be added