## Summary
Fixed a grammatical error in the README files for the website templates.
## Changes
- Fixed grammar in the on-demand revalidation section: changed "or
footer or header, change they will" to "footer, or header changes will"
## Files Changed
- `templates/website/README.md`
- `templates/with-vercel-website/README.md`
## Type of Change
- [x] Documentation fix/improvement
- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
This fixes a typo that was making the sentence grammatically incorrect
and hard to read.
96c24a22da