[docs] [issue35803] Test and document that `dir=...` in tempfile may be PathLike

[Anthony Sottile]

Change by Anthony Sottile <asottile at umich.edu>:


----------
keywords: +patch, patch, patch
pull_requests: +11424, 11425, 11426
stage:  -> patch review

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35803>
_______________________________________