i18n(ko-KR): update i18n.mdx, sidebar.mdx, frontmatter.md

[jsparkdev]

Description

• Astro 6 support #3644

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Latest commit: 196d8fd

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Tracked Files

Locale	File	Note
ko	guides/i18n.mdx	Localization changed, will be marked as complete.
ko	guides/sidebar.mdx	Localization changed, will be marked as complete.
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 the new updates 🌟

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