[Doc] Refine evaluation docs (#701)

* refine evaluation docs

* fix link

* Update docs/zh_cn/design/evaluation.md

Co-authored-by: Qian Zhao <112053249+C1rN09@users.noreply.github.com>

* Update docs/zh_cn/tutorials/evaluation.md

Co-authored-by: RangiLyu <lyuchqi@gmail.com>

* Update docs/zh_cn/tutorials/evaluation.md

Co-authored-by: RangiLyu <lyuchqi@gmail.com>

* resolve comments

* Apply suggestions from code review

* Update docs/zh_cn/tutorials/evaluation.md

Co-authored-by: Qian Zhao <112053249+C1rN09@users.noreply.github.com>
Co-authored-by: RangiLyu <lyuchqi@gmail.com>
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>