i18n(ko): fix Markdown newline in reference/overrides.md

[trueberryless]

Description

• there is no newline in the Korean translation from i18n(ko-KR): update overrides.md #2629
• other translations and original have two spaces before the newline to enforce the newline (i18n(fr): update guides/overriding-components & reference/overrides #2627, Clarify how to override default components that use multiple slots. #2386)

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[trueberryless]

@jsparkdev Do you mind reviewing this PR?

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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.

[jsparkdev]

@trueberryless Good catch, thanks.