Onboarding Docs Error - Not updated to V2, but terraform points to v2 by default

[bensenescu]

Description

While setting up k8s-monitoring using the onboarding docs, I encountered the following error when running terraform apply:

│ Error: execution error at (k8s-monitoring/templates/validations.yaml:1:4): 
│ The Helm chart values appears to be from version 1.x of the k8s-monitoring Helm chart.
│ To continue using version 1.x, add this to your helm command:
│   --version ^1
│ 
│ If you'd like to migrate to version 2.0, see the Migration guide:
│   https://github.com/grafana/k8s-monitoring-helm/blob/main/charts/k8s-monitoring/docs/Migration.md
│ 
│   with helm_release.grafana-k8s-monitoring,
│   on grafana-k8s-monitoring.tf line 1, in resource "helm_release" "grafana-k8s-monitoring":
│    1: resource "helm_release" "grafana-k8s-monitoring" {
│ 

Steps to Reproduce

1. Follow the instructions in linked onboarding docs to install the k8s-monitoring Helm chart.
2. Run terraform apply.
3. Encounter the version mismatch error above.

Suggested Fix

Option 1: Update the documentation to include version = "1.6.23" in the helm_release resource so that people don't hit this error.
Option 2: Change the documentation to explain setting up v2.

Congrats on the release!