importlib.resources.abc.Traversable.joinpath should mention that it can take multiple descendants.

The versionchanged note should mention that some providers might still not support this.

@jaraco, this was officially added in 3.11, right?

Linked PRs

• gh-117074: Update Traversable.joinpath docs to the 3.11+ protocol #117113
• [3.12] gh-117074: Update Traversable.joinpath docs to the 3.11+ protocol (GH-117113) #117571