Typo in official Firebase Documentation

[anweshandev]

Steps to reproduce:

• Go to https://firebase.google.com/docs/hosting/nextjs
• Scroll down to ⭐ Tip: consider using ReactFire, which does this for you automatically.
• Click the link to ReactFire
• Result: Redirects to GitHub, but lands on 404 page.

Fix:

Change link from https://github.com/FirebaseExtended/reactfire/blob/main/README to https://github.com/FirebaseExtended/reactfire/blob/main/README.md

[jhuleatt]

This has been fixed, thanks!