i18n(ko-KR): update routing-reference.mdx

[jsparkdev]

Description (required)

• update routing-reference.mdx
• Add missing code fence #10352

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ko/reference/routing-reference.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.

[yanthomasdev]

LGTM! Thanks!