examples: fix `with-zones` repository name in the deploy link (#74852)
## Summary
At #73546, I missed the deploy link of [`with-zones` example
README.md](https://github.com/vercel/next.js/blob/canary/examples/with-zones/README.md).
This PR fix it.
CC: @samcx
### Adding or Updating Examples
- [x] The "examples guidelines" are followed from our contributing doc
https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md
- [x] Make sure the linting passes by running `pnpm build && pnpm lint`.
See
https://github.com/vercel/next.js/blob/canary/contributing/repository/linting.md