use variable to select system disk

admin-guide/configuration/files/partitioning.md

@@ -54,7 +54,7 @@ To add a new volume to the system disk, you need to address the [lvm Puppet modu
 lvm::volume_groups:
   vg_root:
     physical_volumes:
-      - /dev/nvme0n1p3
+      - "%{lvm_vg_vg_root_pvs}"
     logical_volumes:
       lv_data:
         size: 3TB
@@ -63,8 +63,6 @@ lvm::volume_groups:
         size_is_minsize: true
 ```
 
-Please note that you need also to list the partition on which `vg_root` is located.
-
 The same you can do to add partitions outside of the system disk, but here you need to define the full LVM volume group:
 
 ```yaml
@@ -93,6 +91,3 @@ lvm::volume_groups:
 ```
 but for the `lvm` Puppet module to accept this you need to set `followsymlinks: true`.
 
-
-
-