Fix typo

[mucel29]

Prerequisite Checklist

• [ x] Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Updated relevant documentation (if needed).

Description of changes

[teodutu]

Thanks for the fix. Follow our guidelines [1] to improve your commit message so that checkpatch passes [2]. Modify its title to something like chapters/software-stack: Fix typo in common-functions task + a description of the typo, and sign. You can do this with git commit --amend -s after you've configured your username and email as shown at the beginning of [1]. After that, I'll merge your changes.

[1] https://github.com/cs-pub-ro/operating-systems/blob/main/CONTRIBUTING.md#commits
[2] https://github.com/cs-pub-ro/operating-systems/actions/runs/11321752225/job/31489064010?pr=96