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

Commencez dans la référence principale de pathlib, à la documentation de PurePath.with_segments(), et examinez les références à PurePath.match() et Path.rename(). Documentez que la présence de with_segments est utilisée comme marqueur d’un objet de chemin fondé sur le duck typing, y compris l’implication pour les classes apparentées aux chemins et adjacentes aux chemins ; confirmez que la documentation rendue explique le comportement actuel de Python 3.14.