Remove outdated information

Filip Aleksicrequested to merge
docs-faleksic-docker-group into main

What does this MR do?

The definition removed was for an ancient version of GitLab. Removed the mention.

Considering we don't set the docker group by default as documented here - https://gitlab.com/gitlab-org/gitlab-runner/-/blob/main/docs/executors/shell.md#run-scripts-as-an-unprivileged-user this section is not required.

To play it safe I've also tested this on Arch linux using the latest runner:

[root@alarm ~]# cat /etc/os-release 
NAME="Arch Linux ARM"
PRETTY_NAME="Arch Linux ARM"
(...)

[root@alarm ~]# uname -a
Linux alarm 5.18.1-1-aarch64-ARCH #1 SMP PREEMPT Wed Jun 1 19:34:45 MDT 2022 aarch64 GNU/Linux

[root@alarm ~]# gitlab-runner --version
Version:      18.0.2
Git revision: 4d7093e1
Git branch:   18-0-stable
GO version:   go1.24.3
Built:        2025-05-21T22:00:57Z
OS/Arch:      linux/arm64

[root@alarm ~]# groups gitlab-runner
gitlab-runner : gitlab-runner

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