fix Debian Guide

Author: sus-admin

_posts/2024-12-02-Cobbler-v3.3.7-Debian-Deployment-Guide.md

@@ -46,7 +46,7 @@ That said, continue at your own risk.
 
 While this section describes installing Debian from the local Cobbler server, the resulting system will use the public Debian mirrors for updates and installs going forward. Add a `cobbler repo` entry for those public Debian mirrors with your desired components to be referenced in the auto-install (these repos are only only for metadata, they will not be mirrored or downloaded locally with the below settings)
 
-shell```
+```shell
 sudo cobbler repo add --name bookworm-latest --keep-updated false --mirror-locally false --breed apt --arch x86_64 --mirror "http://deb.debian.org/debian" --apt-components="main non-free non-free-firmware contrib" --apt-dists=bookworm
 sudo cobbler repo add --name bookworm-updates --keep-updated false --mirror-locally false --breed apt --arch x86_64 --mirror "http://deb.debian.org/debian" --apt-components="main non-free non-free-firmware contrib" --apt-dists=bookworm-updates
 sudo cobbler repo add --name bookworm-security --keep-updated false --mirror-locally false --breed apt --arch x86_64 --mirror "http://security.debian.org/debian-security" --apt-components="main non-free non-free-firmware contrib" --apt-dists=bookworm-security
@@ -116,7 +116,7 @@ done 2> /dev/null 1> /dev/null &' | tee -a /var/lib/cobbler/scripts/preseed_earl
 
 Create a new late_apt_repo_config template to not use the Cobbler server as an `apt` mirror post-installation, otherwise will get unskippable error
 
-shell```
+```shell
 grep -v 'deb http://$http_server/cblr/links/$distro_name $os_version main' /var/lib/cobbler/snippets/late_apt_repo_config | tee /var/lib/cobbler/snippets/late_apt_repo_config-no_cobbler
 ```