Proposal: Add `AbortSignal.timeout()` shorthand to "Fetch: Abort" article

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### Description

The ["Fetch: Abort"](https://github.com/javascript-tutorial/en.javascript.info/blob/20208769e528337949e946f526534d61d38bac47/5-network/04-fetch-abort/article.md) article excellently explains the mechanics of `AbortController` and demonstrates a manual timeout using

```js
setTimeout(() => controller.abort(), 1000)
```

Since aborting fetches due to time constraints is a very common use case, it would be highly beneficial for learners to also see the modern [`AbortSignal.timeout()`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/timeout_static) method.

### Proposal

I propose adding a short subsection titled `### AbortSignal.timeout()` immediately following the `try..catch` block of the manual timeout example. This section will demonstrate the shorthand syntax and note the important distinction that it throws a `TimeoutError` rather than an `AbortError`.

Abre 5-network/04-fetch-abort/article.md y lee el ejemplo de timeout manual, especialmente el bloque try..catch. Añade inmediatamente después la subsección propuesta sobre AbortSignal.timeout(), mostrando la forma abreviada y explicando la diferencia entre TimeoutError y AbortError. Se considera terminado cuando el artículo cubra claramente ambos enfoques de timeout.

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