update or remove old examples

Author: dak1n1

_examples/google-gke-cluster/README.md

@@ -1,6 +1,9 @@
-# Example: Ingress
+# Example: Ingress with AWS ELB
 
 ## Prerequisites
 
-*This example uses syntax elements specific to Terraform version 0.12+.
-It will not work out-of-the-box with Terraform 0.11.x and lower.*
+* This example uses syntax elements specific to Terraform version 0.12+.
+It will not work out-of-the-box with Terraform 0.11.x and lower.
+
+* This example uses annotations specific to the [AWS Load Balancer Controller](https://docs.aws.amazon.com/eks/latest/userguide/aws-load-balancer-controller.html).
+