i18n(ko-KR): update content-loader-reference

[jsparkdev]

Description (required)

• Astro v6.0 #12322
• fix: tiny nits in content-loader-reference.mdx #13435
• Small typos #13518

TODO: Update links

• i18n(ko-KR): update markdown-content.mdx #13497

For a smooth documentation translation process, some anchors from multiple links have been temporarily removed.
After this PR is successfully merged, the temporarily modified links will be updated in #13527, #13526.

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Tracked Files

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

[jsparkdev]

@ArmandPhilippot

Thanks for the heads-up!

This PR has been refined to update a single file, content-loader-reference.mdx.

[yanthomasdev]

LGTM! Good work! 🚀