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

Stéphane Wirtel <stephane@wirtel.be> added the comment: Thank you for your contribution, I have merged your PR in main and backported to 3.10 (future stable) and 3.9 (bugfix). ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue44040> _______________________________________