WeChat.Comment.mark_elect

You're seeing just the function mark_elect, go back to WeChat.Comment module for more information.
Link to this function

mark_elect(client, msg_data_id, user_comment_id, index \\ 0)

Specs

mark_elect(
  WeChat.client(),
  msg_data_id(),
  user_comment_id(),
  index :: integer()
) :: WeChat.response()

将评论标记精选 - 官方文档