Mitchell Nielsen authored Jul 06, 2023 and Jason Plum committed Jul 06, 2023

Updates the example values file for using the GKE Ingress Controller.

Previously, you needed to ensure that `spec.ingressClassName` was either
set to `""` or not set at all.

The custom ingress controller docs now directly reference `spec.ingressClassName`:
  https://cloud.google.com/kubernetes-engine/docs/how-to/custom-ingress-controller#ingress_class)

Setting `spec.ingressClassName=""` is no longer a defined scenario. So
to keep things simple, this change removes that example from the
example values file. It also expands the notes in the file to more
clearly explain the configuration.