Update nextjs.md

[KristofaJosh]

You'll find that most users would want to secure pages under a specific route, having this in the documentation can reduce research time.

☕️ Reasoning

Reduce research time

🧢 Checklist

• [x] Documentation
• [ ] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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[ndom91]

Thanks for your interest, but we're not really adding anything to the old docs unless its really necessary.

Also we recommend checking the session / authentication as close to the data fethching / using of the session as possible and not rely only on middleware. The new docs contain examples on middleware matcher usage :pray: