Fix typo in virtual_disk_attach example

Needed if ansible-core < 2.15

Signed-off-by: Justin Cinkelj <justin.cinkelj@xlab.si>

Author: justinc1

examples/virtual_disk_attach.yml

@@ -29,7 +29,7 @@
           - virtual_disk_info_result.records | length == 1
 
     # ------------------------------------------------------
-    - name: Attach virtual disk to VM - {{ vm_name + ", " + virtual_disk_name + " " + vm_disk_type + ":" + vm_disk_slot }}
+    - name: Attach virtual disk to VM - {{ vm_name + ", " + virtual_disk_name + " " + vm_disk_type + ":" + vm_disk_slot | string }}
       scale_computing.hypercore.virtual_disk_attach:
         name: "{{ virtual_disk_name }}"
         vm_name: "{{ vm_name }}"