i18n(ko-KR): update server-side-rendering.mdx

[jsparkdev]

Description (required)

• update server-side-rendering.mdx
• update a code snippet in guides/server-side-rendering.mdx #9700

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ko	guides/server-side-rendering.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.

[dreyfus92]

LGTM ✅