i18n(ko-KR): update documents about content collections

[jsparkdev]

Description (required)

• update content-collections.mdx
• update content-loader-reference.mdx
• update astro-content.mdx
• Updated docs to reflect that getEntry returns undefined #10688
• Content Loader API: include docs for the built-in loaders #10710

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File	Note
ko/guides/content-collections.mdx	Localization changed, will be marked as complete.
ko/reference/content-loader-reference.mdx	Localization changed, will be marked as complete.
ko/reference/modules/astro-content.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]

#10738 is merged, the error is expected to be resolved.

[ArmandPhilippot]

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist and LGTM! I just left a suggestion to update the highlighting in a code block.

Also, it seems that both PRs depend on each other, so maybe you should integrate the other file into this PR to avoid a merge with errors?

[jsparkdev]

@ArmandPhilippot

Thanks for the good point.

Changes from #10738 have been successfully merged into this PR.