compute/slides: Fix broken quiz link

[adriannnv]

The quiz link[1] on slide nr 10: "APP, PROCESS, THREAD - THE BIGGER PICTURE"[2] sends you to an invalid page when clicked. This makes it impossible for users to access the related quiz.

[1] https://cs-pub-ro.github.io/operating-systems/slides/drills/questions/threads-shared-data.md
[2] https://cs-pub-ro.github.io/operating-systems/Compute/