dnf-{group, config-manager}: edit more info link and add option placeholders (#17099)

pages/linux/dnf-config-manager.md

@@ -1,7 +1,7 @@
 # dnf config-manager
 
 > Manage DNF configuration options and repositories on Fedora-based systems.
-> More information: <https://manned.org/dnf-config-manager>.
+> More information: <https://dnf-plugins-core.readthedocs.io/en/latest/config_manager.html>.
 
 - Add (and enable) a repository from a URL:
 

pages/linux/dnf-group.md

@@ -1,24 +1,24 @@
 # dnf group
 
 > Manage virtual collections of packages on Fedora-based systems.
-> More information: <https://manned.org/dnf-group>.
+> More information: <https://dnf.readthedocs.io/en/latest/command_ref.html#group-command>.
 
 - List DNF groups, showing installed and uninstalled status in a table:
 
-`dnf group list`
+`dnf {{[grp|group]}} list`
 
 - Show DNF group info, including repository and optional packages:
 
-`dnf group info {{group_name}}`
+`dnf {{[grp|group]}} info {{group_name}}`
 
 - Install DNF group:
 
-`dnf group install {{group_name}}`
+`dnf {{[grp|group]}} install {{group_name}}`
 
 - Remove DNF group:
 
-`dnf group remove {{group_name}}`
+`dnf {{[grp|group]}} remove {{group_name}}`
 
 - Upgrade DNF group:
 
-`dnf group upgrade {{group_name}}`
+`dnf {{[grp|group]}} upgrade {{group_name}}`