i18n(zh-cn): update untranslate word in directives-reference.mdx

[tsavpyn]

Translated a phrase at 模板指令参考 | Docs

false, null, or undefined: skipped
translated into:
false, null, or undefined: 跳过

---

For more info see chat history
@ https://discord.com/channels/830184174198718474/973149689610371093/1250832177663443034

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[liruifengv]

LGTM. Nice catch, thank you! Welcome to Team Docs!

[yanthomasdev]

LGTM! Good work @tsavpyn 🙌