Update examples

multi-cluster/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-mc-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/
+  paths:
+  - helm-external
+  targetCustomizations:
+  - name: dev
+    clusterSelector:
+      matchLabels:
+        env: dev
+
+  - name: test
+    clusterSelector:
+      matchLabels:
+        env: test
+
+  - name: prod
+    clusterSelector:
+      matchLabels:
+        env: prod
+```

multi-cluster/helm-external/fleet.yaml

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+namespace: fleet-mc-helm-external-example
+helm:
+  chart: https://github.com/rancher/fleet-examples/releases/download/example/guestbook-0.0.0.tgz
+targets:
+- name: dev
+  helm:
+    values:
+      replication: false
+  clusterSelector:
+    matchLabels:
+      env: dev
+
+- name: test
+  helm:
+    values:
+      replicas: 3
+  clusterSelector:
+    matchLabels:
+      env: test
+
+- name: prod
+  helm:
+    values:
+      serviceType: LoadBalancer
+      replicas: 3
+  clusterSelector:
+    matchLabels:
+      env: prod