Update examples

helm-external/README.md

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+# Helm External Example
+
+This example will deploy the [Kubernetes sample guestbook](https://github.com/kubernetes/examples/tree/master/guestbook/) application as
+packaged as a Helm chart downloaded from a third party source.
+The app will be deployed into the `fleet-helm-external-example` namespace.
+
+The application will be customized as follows per environment:
+
+* Dev clusters: Only the redis leader is deployed and not the followers.
+* Test clusters: Scale the front deployment to 3
+* Prod clusters: Scale the front deployment to 3 and set the service type to LoadBalancer
+
+```yaml
+kind: GitRepo
+apiVersion: fleet.cattle.io/v1alpha1
+metadata:
+  name: helm-external
+  namespace: fleet-local
+spec:
+  repo: https://github.com/rancher/fleet-examples/
+  bundleDirs: helm-external
+```