docs: add layout to match custom header example

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#13829

❓ 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

Adds the other half of the example.

📝 Checklist

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

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[tobiasdiez]

Thanks for the clarification. So one has to use the NuxtLayout component in order to define the templates for named slots, or is there a more elegant solution?

[danielroe]

Yes, that's required at the moment. There was talk of <template layout="custom"> but that's not technically valid SFC syntax and would require updating in tooling as well as a Nuxt compile transform.

[tobiasdiez]

Okay, make sense. Thanks!