i18n(ko-KR): update tutorial/6-islands/4.mdx

[jsparkdev]

Description (required)

• update tutorial/6-islands/4.mdx
• Added checklist component to the optional content collection tutorial. #10649

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Warnings reference

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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.

[yanthomasdev]

LGTM! Thanks!