Remove k8s version from install;update min version

Author: Kate Osborn

README.md

@@ -41,7 +41,7 @@ The following table lists the software versions NGINX Kubernetes Gateway support
 
 | NGINX Kubernetes Gateway | Gateway API | Kubernetes | NGINX OSS |
 |-|-|-|-|
-| 0.1.0 | 0.5.0 | 1.16+ | 1.21.3|
+| 0.1.0 | 0.5.0 | 1.19 | 1.21.3|
 
 ## Contacts
 

docs/installation.md

@@ -5,7 +5,6 @@ This guide walks you through how to install NGINX Kubernetes Gateway on a generi
 ## Prerequisites
 
 - [kubectl](https://kubernetes.io/docs/tasks/tools/)
-- Kubernetes 1.16+ cluster
 
 ## Deploy NGINX Kubernetes Gateway