chore: cleanup vars and add docs

defaults/main.yml

@@ -1,18 +1,18 @@
 ---
 pve_pamd_motd_enabled: True
 
-pve_disk_mount: []
+# @var pve_disk_mount:example: >
-## Example:
 # pve_disk_mount:
 #   - path: /mnt/backup
 #     src: /dev/sdX
 #     fstype: ext4
 #     opts:
 #     state: present
+# @end
+pve_disk_mount: []
 
-# Configure pam auth
 pve_auth_pam_is_default: True
 pve_auth_pam_description: Linux PAM standard authentication
 
 pve_auth_pve_is_default: False
-pve_auth_pve_description: Linux pve standard authentication
+pve_auth_pve_description: Proxmox VE authentication server