added info for docker registry access

Author: dkleinF5

content/waf/install/kubernetes-plm.md

@@ -40,6 +40,7 @@ To complete this guide, you will need the following prerequisites:
 - [kubectl CLI](https://kubernetes.io/docs/tasks/tools/install-kubectl/) configured and connected to your cluster
 - [Helm](https://helm.sh/docs/intro/install/)
 - [Docker](https://docs.docker.com/get-started/get-docker/)
+- Docker registry credentials — needed to access private-registry.nginx.com
 - Active F5 NGINX App Protect WAF subscription in [MyF5](https://my.f5.com/manage/s/) (purchased or trial)
 - Credentials to the [MyF5 Customer Portal](https://account.f5.com/myf5), provided by email from F5, Inc.
 

content/waf/install/kubernetes.md

@@ -22,6 +22,7 @@ To complete this guide, you will need the following pre-requisites:
 - [kubectl CLI](https://kubernetes.io/docs/tasks/tools/install-kubectl/) configured and connected to your cluster
 - Active F5 NGINX App Protect WAF subscription in [MyF5](https://my.f5.com/manage/s/) (purchased or trial)
 - [Docker](https://docs.docker.com/get-started/get-docker/)
+- Docker registry credentials — needed to access private-registry.nginx.com
 
 You will need [Helm](https://helm.sh/docs/intro/install/) installed for a Helm-based deployment.