docs: (tutorials/index.md & async-function.md ): [translate] Done

[DarrenWong]

Checklist

• documentation is changed or added

Affected core subsystem(s)

docs/source/en/tutorials/index.md
docs/source/en/tutorials/async-function.md

Description of change

translated egg/docs/source/zh-cn/tutorials/index.md and egg/docs/source/zh-cn/tutorials/async-function.md

[codecov]

Codecov Report

Merging #1028 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1028   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files          28       28           
  Lines         675      675           
=======================================
  Hits          664      664           
  Misses         11       11

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[dead-horse]

great work!

[fengmk2]

#363