fix example

quickstart/301-machine-learning-hub-spoke-secure/main.tf

@@ -14,7 +14,16 @@ terraform {
 }
 
 provider "azurerm" {
-  features {}
+  features {
+    key_vault {
+      recover_soft_deleted_key_vaults    = false
+      purge_soft_delete_on_destroy       = false
+      purge_soft_deleted_keys_on_destroy = false
+    }
+    resource_group {
+      prevent_deletion_if_contains_resources = false
+    }
+  }
 }
 
 data "azurerm_client_config" "current" {}