docs: update to latest var name

JacobCoffee · JacobCoffee · commit e782de1f6c1d · 2024-09-10T12:14:49.000-05:00
diff --git a/infra/cdn/README.md b/infra/cdn/README.md
@@ -44,7 +44,7 @@ module "fastly_production" {
   source = "./cdn"
 
   ...
-  enable_ngwaf = true
+  activate_ngwaf_service = true
   ...
 }
 ```
