add ubuntu-release doc in ubuntu.md

hust-open-atom-club / hust-mirrors

华中科技大学开源镜像站前端

https://mirrors.hust.edu.cn

MIT License

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Closed tttturtle-russ closed 3 months ago

tttturtle-russ commented 3 months ago

add ubuntu-release doc in ubuntu.md. It can be accessed by https://mirrors.hust.edu.cn/docs/ubuntu#cd. Ref to #29