i18n(zh-cn): Update v5.mdx and related docs

[Nin3lee]

Description (required)

Update v5.mdx and related docs

• v5.mdx
• mixed-content-data-collection-error.mdx
• content-collection-type-mismatch-error.mdx
• content-schema-contains-slug-error.mdx
• integrations-reference.mdx
• adapter-reference.mdx
• content-collections.mdx

Related issues & labels (optional)

• 5.0.0 beta docs #9240
• Suggested label: i18n

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Tracked Files

File	Note
zh-cn/guides/content-collections.mdx	Localization changed, will be marked as complete.
zh-cn/guides/upgrade-to/v4.mdx	Localization changed, will be marked as complete.
zh-cn/guides/upgrade-to/v5.mdx	Localization added, will be marked as complete.
zh-cn/reference/adapter-reference.mdx	Localization changed, will be marked as complete.
zh-cn/reference/errors/content-collection-type-mismatch-error.mdx	Localization changed, will be marked as complete.
zh-cn/reference/errors/content-schema-contains-slug-error.mdx	Localization changed, will be marked as complete.
zh-cn/reference/errors/mixed-content-data-collection-error.mdx	Localization changed, will be marked as complete.
zh-cn/reference/integrations-reference.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	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.

[Nin3lee]

将 legacy 译作的 遗留 统一修改为与之前文档相统一的 旧版。

[liruifengv]

LGTM! Thank you!