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

[jsparkdev]

Description (required)

• update markdown-content.mdx
• new markdown content page #9344

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Tracked Files

Locale	File	Note
ko	guides/markdown-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]

If this PR is successfully merged, I expect #9355, #9361, and #9363 to also be merged successfully.

[yanthomasdev]

LGTM! Amazing work! 💜