docs(seed-docs): fix typo in box button usage

[yoonk2]

[changeset-bot]

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Latest commit: 9d3dc8c

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[github-actions]

Deploy Seed Docs Alpha Pages / Deploy Seed Docs (push) CI가 성공적으로 끝나면 해당 링크로 이동해서 preview를 확인해요 -> https://dash.cloudflare.com/aad5c82543cd1f267b89737d0f56405e/pages/view/seed-design