doc: added missing import in auto-form example

[skf-funzt]

I've added a missing import of auto-form to the first complete example as without the code, it would not run right away.

🔗 Linked issue

No issue is available, as I just came here from the official website.

❓ 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

In the first complete code example of the auto-form, the import of auto-form is missing.

📸 Screenshots (if appropriate)

📝 Checklist

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