i18n(zh-cn): Update markdown-content.mdx

[liruifengv]

Description (required)

Update markdown-content.mdx

Related issues & labels (optional)

• Redistribute Built-in components and remove page #9888

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zh-cn	guides/markdown-content.mdx	Localization changed, will be marked as complete.

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[Nin3lee]

#9888 里面还把 第 320 行~第 442 行这些重复的部分 给删掉了。

[liruifengv]

#9888 里面还把 第 320 行~第 442 行这些重复的部分 给删掉了。

Done

[Nin3lee]

LGTM!