docs: fix URL for error message (#71788)
## Description
Fix URL for https://nextjs.org/docs/messages/missing-root-layout-tags
❌wrong:
https://nextjs.org/docs/app/building-your-application/routing/pages-and-layouts#root-layout-required
✅correct:
https://nextjs.org/docs/app/building-your-application/routing/layouts-and-templates#root-layout-required
### Improving Documentation
- [x] Run `pnpm prettier-fix` to fix formatting issues before opening
the PR.
- [x] Read the Docs Contribution Guide to ensure your contribution
follows the docs guidelines:
https://nextjs.org/docs/community/contribution-guide
Co-authored-by: JJ Kasper <jj@jjsweb.site>
