docs(config): correct naming of NUXT_APP_CDN_URL environment variable

[srtonz]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When setting up CDN configuration Nuxt parses the value of NUXT_APP_CDN_URL, but documentation is incorrectly showing the variable as CDN_URL.

framework/packages/schema/src/config/_app.ts

Line 70 in cd37a21

$resolve: (val, get) => get('dev') ? '' : (process.env.NUXT_APP_CDN_URL ?? val) || ''

📝 Checklist

• I have linked an issue or discussion.

If you spot an area where we can improve documentation or error messages, please do open a PR - even if it's just to fix a typo!

Implies no issue required.

• I have updated the documentation accordingly.

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[pi0]

Thanks!