fix(typography): fix the language tag for Korean

[xfq]

Proposed changes

Fix the BCP 47 language tag for Korean.

It should be ko (search for "Korean" in https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry for details).

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Linked Issues

Further comments

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Name	Status	Preview	Comments	Updated (UTC)
unocss-preset-chinese-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 22, 2023 4:14am