fixed typo

main.tf

@@ -72,7 +72,7 @@ module "create-ohpc-instance" {
     floating_ip_ohpc = module.floating-ip-address.ohpc_address
     ohpc_user =  var.ohpc_user
     ssh_private_key = var.ssh_private_key
-    vol_ids = [
+    vol_id = [
       data.openstack_blockstorage_volume_v3.disk.id,
       data.openstack_blockstorage_volume_v3.disk2.id,
     ]