Update man page
- Make changes from 5b6825c5 in ecm.xml
- Add GCD function
- Add name to Phi
- Demonstrate parenthesis in example
GitLab upgrade completed. Current version is 18.3.6
https://about.gitlab.com/releases/2025/07/17/gitlab-18-2-released/
https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/