[3.11] gh-90744: Fix erroneous doc links in the sys module (GH-101319) (#102321)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-authored-by: Brad Wolfe <brad.wolfe@gmail.com>
Co-authored-by: Furkan Onder <furkanonder@protonmail.com>
Fix erroneous doc links in the sys module (#101319)