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

[jsparkdev]

Description (required)

• Astro v6.0 #12322

TODO: Update links

• i18n(ko-KR): update errors/ and error-reference.mdx #13488
• i18n(ko-KR): update content-loader-reference #13494

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 #13526, #13494.

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ko/guides/content-collections.mdx	Localization changed, will be marked as complete.
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🔄️	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]

required: #13494