Update middleware examples list (#35622)

Logging and analytics are not provided in vercel/examples using middleware.



## 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

- [ ] Make sure the linting passes by running `yarn lint`

docs/api-reference/next/server.md

@@ -55,8 +55,6 @@ The `NextFetchEvent` object extends the native [`FetchEvent`](https://developer.
 
 The `waitUntil()` method can be used to prolong the execution of the function, after the response has been sent. In practice this means that you can send a response, then continue the function execution if you have other background work to make.
 
-An example of _why_ you would use `waitUntil()` is integrations with logging tools such as [Sentry](https://sentry.io) or [DataDog](https://www.datadoghq.com). After the response has been sent, you can send logs of response times, errors, API call durations or overall performance metrics.
-
 The `event` object is fully typed and can be imported from `next/server`.
 
 ```ts

docs/middleware.md

@@ -71,9 +71,7 @@ Middleware can be used for anything that shares logic for a set of pages, includ
 - [Redirects and rewrites](https://github.com/vercel/examples/tree/main/edge-functions)
 - [Handling unsupported browsers](https://github.com/vercel/examples/tree/main/edge-functions)
 - [Feature flags and A/B tests](https://github.com/vercel/examples/tree/main/edge-functions)
-- [Server-side analytics](https://github.com/vercel/examples/tree/main/edge-functions)
 - [Advanced i18n routing requirements](https://github.com/vercel/examples/tree/main/edge-functions)
-- [Logging](https://github.com/vercel/examples/tree/main/edge-functions)
 
 ## Execution Order