Link configuration snippet to allow-snippet-annotations (#10456)

Author: StefanLobbenmeierObjego

docs/user-guide/nginx-configuration/annotations.md

@@ -316,7 +316,7 @@ nginx.ingress.kubernetes.io/configuration-snippet: |
   more_set_headers "Request-Id: $req_id";
 ```
 
-Be aware this can be dangerous in multi-tenant clusters, as it can lead to people with otherwise limited permissions being able to retrieve all secrets on the cluster. The recommended mitigation for this threat is to disable this feature, so it may not work for you. See CVE-2021-25742 and the [related issue on github](https://github.com/kubernetes/ingress-nginx/issues/7837) for more information.
+Since version 1.9.0 this annotation is disabled by default and has to be explicitly enabled, see [allow-snippet-annotations](./configmap.md/#allow-snippet-annotations). Enabling it can be dangerous in multi-tenant clusters, as it can lead to people with otherwise limited permissions being able to retrieve all secrets on the cluster. See CVE-2021-25742 and the [related issue on github](https://github.com/kubernetes/ingress-nginx/issues/7837) for more information.
 
 ### Custom HTTP Errors