🌐 Add Chinese translation for `docs/zh/docs/async.md` (#5591)
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jedore <jedore_fight@189.cn>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
Co-authored-by: 吴定焕 <108172295+wdh99@users.noreply.github.com>