Various updates/fixes of the documentation (!135) · Merge requests · melissa / Melissa · GitLab

Mentions légales du service

GitLab upgrade completed. Current version is 18.5.4
https://about.gitlab.com/releases/2025/09/18/gitlab-18-4-released/
https://about.gitlab.com/releases/2025/10/16/gitlab-18-5-released/

This MR updates outdated parts of the documentation.