Merge pull request #13606 from nextcloud/backport/13589/stable32

[stable32] fix formatting of code sample

Author: AndyScherzinger

admin_manual/occ_command.rst

@@ -250,7 +250,7 @@ enabled or disabled::
 
  sudo -E -u www-data php occ app:list
 
-List all of your installed and enabled (flag `--enabled`) or disabled (flag `--disabled`) apps::
+List all of your installed and enabled (flag ``--enabled``) or disabled (flag ``--disabled``) apps::
 
  sudo -E -u www-data php occ app:list --enabled