Update api-middlewares.md (#38499)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

docs/api-routes/api-middlewares.md

@@ -140,7 +140,7 @@ async function handler(req, res) {
 export default handler
 ```
 
-> Go to the [API Routes with CORS](https://github.com/vercel/next.js/tree/canary/examples/api-routes-cors) example to see the finished app
+> Go to the [API Routes with CORS](https://github.com/vercel/next.js/tree/canary/examples/api-routes-cors) example to see the finished app.
 
 ## Extending the `req`/`res` objects with TypeScript