docs: add missing prerequisite for installation

Author: dkleinF5

content/waf/install/virtual-environment.md

@@ -23,13 +23,11 @@ This page describes how to install F5 WAF for NGINX in a virtual machine or bare
 To complete this guide, you will need the following prerequisites:
 
 - A [supported operating system]({{< ref "/waf/fundamentals/technical-specifications.md#supported-operating-systems" >}}).
-- A working [NGINX Open Source]({{< ref "/nginx/admin-guide/installing-nginx/installing-nginx-open-source.md" >}}) or [NGINX Plus]({{< ref "/nginx/admin-guide/installing-nginx/installing-nginx-plus.md" >}}) instance.
+- A working [NGINX Plus]({{< ref "/nginx/admin-guide/installing-nginx/installing-nginx-plus.md" >}}) instance.
 - An active F5 WAF for NGINX subscription (Purchased or trial).
 
 Depending on your deployment type, you may have additional requirements:
 
-- [Docker](https://docs.docker.com/get-started/get-docker/) is required for NGINX Open Source or NGINX Plus type deployments.
-
 You should read the [IP intelligence]({{< ref "/waf/policies/ip-intelligence.md" >}}) and [Secure traffic using mTLS]({{< ref "/waf/configure/secure-mtls.md" >}}) topics for additional set-up configuration if you want to use them immediately.
 
 {{< include "waf/install-selinux-warning.md" >}}