Update env_setup.md

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46365#note_438172954

doc/university/training/topics/env_setup.md

@@ -11,7 +11,7 @@ comments: false
   - Type '`git`' in the Terminal application.
   - If it's not installed, it will prompt you to install it.
 
-- **Linux** - Enter `which git` in the Terminal application and press <kbd>Enter</kbd> to
+- **GNU/Linux** - Enter `which git` in the Terminal application and press <kbd>Enter</kbd> to
   determine if Git is installed on your system.
 
   - If the output of that command gives you the path to the Git executable, similar to
@@ -29,8 +29,8 @@ comments: false
   - **Debian/Ubuntu and their derivatives** - `sudo apt-get install git`
   - **Gentoo** - `sudo emerge --ask --verbose dev-vcs/git`
   - **openSUSE** - `sudo zypper install git`
-  - **FreeBSD** - `sudo pkg install git`
-  - **OpenBSD** - `doas pkg_add git`
+- **FreeBSD** - `sudo pkg install git`
+- **OpenBSD** - `doas pkg_add git`
 
 ## Configure Git