remove VPC block from example

Author: FlorinAndrei

examples/redis-cluster/main.tf

@@ -38,12 +38,6 @@ module "elasticache" {
   # Security Group
   vpc_id = module.vpc.vpc_id
   security_group_rules = {
-    ingress_vpc = {
-      # Default type is `ingress`
-      # Default port is based on the default engine port
-      description = "VPC traffic"
-      cidr_ipv4   = module.vpc.vpc_cidr_block
-    }
     ingress-self-redis = {
       type = "ingress"
       referenced_security_group_id = "self"