Update helm docs to be more clear for EKS (sourcegraph#47811)

## Test plan

* Tested Doc changes by deploying and following steps, then
troubleshooting issues and adding solutions to default
suggestions/information on necessary changes
* Only Doc changes, no code change

<!-- All pull requests REQUIRE a test plan:
https://docs.sourcegraph.com/dev/background-information/testing_principles
-->

doc/admin/deploy/kubernetes/helm.md

@@ -27,9 +27,10 @@ Our Helm chart has a lot of sensible defaults baked into the values.yaml. Not on
 
 1. Prepare any required customizations
  - Most environments are likely to need changes from the defaults—use the guidance in [Configuration](#configuration).
-1. Review the changes
+ - These changes are inclusive of updates to resourcing for each service. See our [resource estimator](../resource_estimator.md) for more information.
+2. Review the changes
  - There are [three mechanisms](#reviewing-changes) that can be used to review any customizations made, this is an optional step, but may be useful the first time you deploy Sourcegraph, for peace of mind.
-1. Select your deployment method and follow the guidance:
+3. Select your deployment method and follow the guidance:
  - [Google GKE](#configure-sourcegraph-on-google-kubernetes-engine-gke)
  - [AWS EKS](#configure-sourcegraph-on-elastic-kubernetes-service-eks)
  - [Azure AKS](#configure-sourcegraph-on-azure-managed-kubernetes-service-aks)
@@ -610,6 +611,9 @@ frontend:
  ingress:
  enabled: true
  annotations:
+ alb.ingress.kubernetes.io/target-type: ip # specifies targeting services with type ClusterIP
+ # By default the AWS ALB will be internal to your VPC.
+ # alb.ingress.kubernetes.io/scheme: internet-facing # use this annotation if you plan to provision a public Sourcegraph URL.
  kubernetes.io/ingress.class: alb # aws load balancer controller ingressClass name
  # additional aws alb ingress controller supported annotations
  # ...