i18n(zh-cn): Fix code example in tutorial/5-astro-api/3.mdx

[wnw231423]

Description (required)

Fix an inconsistent code example in the zh-cn translation to match the correct one in the English documentation.

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[liruifengv]

LGTM! Thank you!