fix(check_deps): clarify to run the generated command as root

[MicLieg]

Description

The generated command to install the missing dependencies was not easy for new users to understand, resulting in those users needing support and asking for help.

Before

After

Type of change

• [x] Bug fix (a change which fixes an issue).
• [ ] New feature (a change which adds functionality).
• [ ] New Server (new server added).
• [ ] Refactor (restructures existing code).
• [ ] Comment update (typo, spelling, explanation, examples, etc).

Checklist

PR will not be merged until all steps are complete.

• [ ] This pull request links to an issue.
• [x] This pull request uses the develop branch as its base.
• [x] This pull request subject follows the Conventional Commits standard.
• [x] This code follows the style guidelines of this project.
• [x] I have performed a self-review of my code.
• [x] I have checked that this code is commented where required.
• [x] I have provided a detailed enough description of this PR.
• [x] I have checked if documentation needs updating.

Documentation

If documentation does need updating either update it by creating a PR (preferred) or request a documentation update.

• User docs: https://github.com/GameServerManagers/LinuxGSM-Docs
• Dev docs: https://github.com/GameServerManagers/LinuxGSM-Dev-Docs

Thank you for your Pull Request!