docs: fix typo

[nozomuikuta]

🔗 Linked issue

Resolves #755

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I just fixed a typo.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[cloudflare-workers-and-pages]

Deploying unjs-h3 with    Cloudflare Pages

Latest commit:	6192add
Status:	✅  Deploy successful!
Preview URL:	https://7e131b5f.unjs-h3.pages.dev
Branch Preview URL:	https://docs-fix-typos.unjs-h3.pages.dev

View logs