i18n(ko-KR): update frontmatter.md

[jsparkdev]

Description

• update frontmatter.md
• update wrong links
• Astro 5 + collection loaders + legacy collections support #2612

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Locale	File	Note
ko	reference/frontmatter.md	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.

[HiDeoo]

Thanks for another great translation 🌟

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist and this looks perfect to me.