Update the Cleanup section for Istio in Getting Started

[shotarok]

Resolves #896

This PR updates the Cleanup section for Istio in Getting Started. I attached the logs when I executed the commands with my cluster.

Details

$ ./istioctl uninstall -y --purge
All Istio resources will be pruned from the cluster

  Removed apps/v1, Kind=Deployment/istio-ingressgateway.istio-system.
  Removed apps/v1, Kind=Deployment/istiod.istio-system.
  Removed /v1, Kind=Service/istiod.istio-system.
  Removed /v1, Kind=ConfigMap/istio.istio-system.
  Removed /v1, Kind=ConfigMap/istio-sidecar-injector.istio-system.
  Removed /v1, Kind=Pod/istio-ingressgateway-7d467856b8-7rzvt.istio-system.
  Removed /v1, Kind=Pod/istiod-66b6b78b68-j8fc4.istio-system.
  Removed /v1, Kind=ServiceAccount/istio-ingressgateway-service-account.istio-system.
  Removed /v1, Kind=ServiceAccount/istio-reader-service-account.istio-system.
  Removed /v1, Kind=ServiceAccount/istiod.istio-system.
  Removed rbac.authorization.k8s.io/v1, Kind=RoleBinding/istio-ingressgateway-sds.istio-system.
  Removed rbac.authorization.k8s.io/v1, Kind=RoleBinding/istiod.istio-system.
  Removed rbac.authorization.k8s.io/v1, Kind=Role/istio-ingressgateway-sds.istio-system.
  Removed rbac.authorization.k8s.io/v1, Kind=Role/istiod.istio-system.
  Removed policy/v1, Kind=PodDisruptionBudget/istio-ingressgateway.istio-system.
  Removed policy/v1, Kind=PodDisruptionBudget/istiod.istio-system.
  Removed autoscaling/v2, Kind=HorizontalPodAutoscaler/istio-ingressgateway.istio-system.
  Removed autoscaling/v2, Kind=HorizontalPodAutoscaler/istiod.istio-system.
  Removed admissionregistration.k8s.io/v1, Kind=MutatingWebhookConfiguration/istio-revision-tag-default..
  Removed admissionregistration.k8s.io/v1, Kind=MutatingWebhookConfiguration/istio-sidecar-injector..
  Removed admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration/istio-validator-istio-system..
  Removed admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration/istiod-default-validator..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRole/istio-reader-clusterrole-istio-system..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRole/istiod-clusterrole-istio-system..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRole/istiod-gateway-controller-istio-system..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRoleBinding/istio-reader-clusterrole-istio-system..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRoleBinding/istiod-clusterrole-istio-system..
  Removed rbac.authorization.k8s.io/v1, Kind=ClusterRoleBinding/istiod-gateway-controller-istio-system..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/authorizationpolicies.security.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/destinationrules.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/envoyfilters.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/gateways.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/peerauthentications.security.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/proxyconfigs.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/requestauthentications.security.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/serviceentries.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/sidecars.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/telemetries.telemetry.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/virtualservices.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/wasmplugins.extensions.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/workloadentries.networking.istio.io..
  Removed apiextensions.k8s.io/v1, Kind=CustomResourceDefinition/workloadgroups.networking.istio.io..
✔ Uninstall complete

$ k delete ns istio-system
namespace "istio-system" deleted

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[ahg-g]

/ok-to-test

[ahg-g]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, shotarok

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