Fix ruby syntax for 'ko' docs

[internetisaiah]

Why are you making this change? (required)

One of the ruby {% endapiref %} tags got accidently translated to korean, breaking vercel. I've reverted the tag back to english.

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Name	Status	Preview	Comments	Updated (UTC)
braze-docs-ko	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 1, 2024 5:46pm