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

[jsparkdev]

Description

• Aside: Support custom icons #2261

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Tracked Files

Locale	File	Note
ko	guides/authoring-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.

[HiDeoo]

Thanks for the new update.

As a non-native speaker, I reviewed this PR using the Docs Translation Review Checklist and this looks great to me 🌟