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

Description

The "Fetch: Abort" article excellently explains the mechanics of AbortController and demonstrates a manual timeout using

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() 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.

Apri 5-network/04-fetch-abort/article.md e leggi l’esempio di timeout manuale, in particolare il blocco try..catch. Aggiungi subito dopo la sottosezione proposta su AbortSignal.timeout(), mostrando la forma abbreviata e spiegando la distinzione tra TimeoutError e AbortError. Il lavoro è completato quando l’articolo tratta chiaramente entrambi gli approcci al timeout.