Document pathlib with_segments duck typing for path object arguments

Some pathlib methods use the presence of a with_segments attribute to decide whether an argument is already a path object.

This behavior was changed in gh-128520 / GH-130199 for Python 3.14. The main pathlib reference documents PurePath.with_segments(), but it does not currently mention that methods such as PurePath.match() and Path.rename() use with_segments as this duck-typed marker.

This can surprise authors of path-like or path-adjacent classes that define with_segments without implementing os.PathLike. The docs should describe the current behavior so subclass and third-party path authors have a clear contract to work from.

Linked PRs

• gh-153394

Inizia nella documentazione di riferimento principale di pathlib, alla documentazione di PurePath.with_segments(), e rivedi i riferimenti a PurePath.match() e Path.rename(). Documenta che la presenza di with_segments viene usata come indicatore di un oggetto percorso basato sul duck typing, inclusa l’implicazione per le classi simili ai percorsi e adiacenti ai percorsi; conferma che la documentazione renderizzata spiega il comportamento attuale di Python 3.14.