i18n(ko-KR): update content-collections.mdx

[jsparkdev]

Description (required)

• update content-collections.mdx
• split API reference into modules #9687

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Locale	File	Note
ko	guides/content-collections.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.

[jsparkdev]

Once #9815 is merged, it is expected that all errors in this PR will be resolved.

[yanthomasdev]

LGTM! Thanks!