docs(kubernetes): use explicit Velero restore name in backup guide

Address review feedback from coderabbitai on
content/en/docs/next/kubernetes/backups-with-velero-addon.md:158-161:
without an explicit restore name, `velero restore create --from-backup demo-1`
auto-generates `demo-1-<timestamp>`, so `velero restore describe demo-1`
would fail. Pass `demo-1-restore` as the explicit restore name on both
commands.

Signed-off-by: Andrey Kolkov <androndo@gmail.com>

Author: androndo

content/en/docs/next/kubernetes/backups-with-velero-addon.md

@@ -155,9 +155,9 @@ Simulate a loss by deleting the namespace, then restore it from the backup:
 
 ```bash
 kubectl delete namespace demo
-velero -n cozy-velero restore create \
+velero -n cozy-velero restore create demo-1-restore \
   --from-backup demo-1
-velero -n cozy-velero restore describe demo-1 --details
+velero -n cozy-velero restore describe demo-1-restore --details
 ```
 
 When the restore reaches `Phase: Completed`, the namespace and its objects are recreated. Verify: