code: def markelect_comment(self, msg_data_id, index, user_comment_id):
          
          return self._post(
              'comment/markelect',
              data={
                  'msg_data_id': msg_data_id,
                  'index': index,
                  'user_comment_id': user_comment_id,
              })
docs: 将评论标记精选