Update example for metrics and trafic routers

Signed-off-by: Robert Macaulay <robert.macaulay@gmail.com>

charts/argo-rollouts/values.yaml

@@ -209,17 +209,15 @@ controller:
 
   # -- Configures 3rd party metric providers for controller
   ## Ref: https://argo-rollouts.readthedocs.io/en/stable/analysis/plugins/
-  metricProviderPlugins: {}
-    # metricProviderPlugins:
-    #   - name: "argoproj-labs/sample-prometheus" # name of the plugin, it must match the name required by the plugin so that it can find its configuration
-    #     location: "file://./my-custom-plugin" # supports http(s):// urls and file://
+  metricProviderPlugins: []
+    # - name: "argoproj-labs/sample-prometheus" # name of the plugin, it must match the name required by the plugin so that it can find its configuration
+    #   location: "file://./my-custom-plugin" # supports http(s):// urls and file://
 
   # -- Configures 3rd party traffic router plugins for controller
   ## Ref: https://argo-rollouts.readthedocs.io/en/stable/features/traffic-management/plugins/
-  trafficRouterPlugins: {}
-    # trafficRouterPlugins:
-    #   - name: "argoproj-labs/sample-nginx" # name of the plugin, it must match the name required by the plugin so it can find it's configuration
-    #     location: "file://./my-custom-plugin" # supports http(s):// urls and file://
+  trafficRouterPlugins: []
+    # - name: "argoproj-labs/sample-nginx" # name of the plugin, it must match the name required by the plugin so it can find it's configuration
+    #   location: "file://./my-custom-plugin" # supports http(s):// urls and file://
 
 serviceAccount:
   # -- Specifies whether a service account should be created