Doc update for NLB-IP prereq (kubernetes-sigs#1818)

Author: kishorj

docs/guide/service/nlb_ip_mode.md

@@ -4,7 +4,7 @@ AWS Load Balancer Controller supports Network Load Balancer (NLB) with IP target
 ## Prerequisites
 * AWS LoadBalancer Controller >= v2.0.0
 * Kubernetes >= v1.15 for Service type NodePort.
-* Kubernetes >= v1.20 or EKS >= 1.18 for Service type LoadBalancer.
+* Kubernetes >= v1.20 or EKS >= 1.16 for Service type LoadBalancer.
 * Pods have native AWS VPC networking configured, see [Amazon VPC CNI plugin](https://github.com/aws/amazon-vpc-cni-k8s)
 
 ## Configuration