[docs] [issue44040] Update broken link in pathlib source

Change by miss-islington <mariatta.wijaya+miss-islington@gmail.com>: ---------- pull_requests: +24580 pull_request: https://github.com/python/cpython/pull/25911 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue44040> _______________________________________