Update vpc-byo-aws.adoc - add create_internet_gateway flag (#303)

* Update vpc-byo-aws.adoc

* Update modules/get-started/pages/cluster-types/byoc/aws/vpc-byo-aws.adoc

* Update vpc-byo-aws.adoc

remove duplicat create_rpk_user

---------

Co-authored-by: Michele Cyran <[email protected]>

Author: david-yu

modules/get-started/pages/cluster-types/byoc/aws/vpc-byo-aws.adoc

@@ -87,7 +87,7 @@ cat > byoc.auto.tfvars.json <<EOF
     "use2-az2",
     "use2-az3"
   ],
-  "create_rpk_user": true,
+  "create_internet_gateway": true, 
   "enable_private_link": false,
   "create_rpk_user": true,
   "force_destroy_cloud_storage": true,
@@ -104,7 +104,7 @@ EOF
 
 ```
 
-NOTE: At least one public subnet is required to create a cluster. The example configuration includes multiple public subnets to allow for future scaling. In addition, the VPC should have an Internet Gateway and an associated Route Table that exposes traffic into the VPC, and allows the Redpanda Control Plane to access the cluster.
+NOTE: At least one public subnet is required to create a cluster. The example configuration includes multiple public subnets to allow for future scaling. The example above creates an Internet Gateway and an associated Route Table rule that exposes traffic into the VPC, which allows the Redpanda Control Plane to access the cluster. To disable creation of the Internet Gateway, either remove the configuration and value for `create_internet_gateway` or set `"create_internet_gateway": false`.
 
 
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