[stable/kubernetes-dashboard] Fix extraArgs documentation (#3675)

* [stable/kubernetes-dashboard] Fix `extraArgs`

* Update documentation

stable/kubernetes-dashboard/Chart.yaml

@@ -1,5 +1,5 @@
 name: kubernetes-dashboard
-version: 0.5.2
+version: 0.5.3
 appVersion: 1.8.1
 description: General-purpose web UI for Kubernetes clusters
 keywords:

stable/kubernetes-dashboard/README.md

@@ -42,7 +42,7 @@ The following tables lists the configurable parameters of the kubernetes-dashboa
 | `image.repository`     | Repository for container image     | `gcr.io/google_containers/kubernetes-dashboard-amd64`                    |
 | `image.tag`            | Image tag                          | `v1.8.1`                                                                 |
 | `image.pullPolicy`     | Image pull policy                  | `IfNotPresent`                                                           |
-| `extraArgs`            | Additional container arguments     | `{}`                                                                     |
+| `extraArgs`            | Additional container arguments     | `[]`                                                                     |
 | `nodeSelector`         | node labels for pod assignment     | `{}`                                                                     |
 | `service.externalPort` | Dashboard internal port            | 80                                                                       |
 | `service.internalPort` | Dashboard external port            | 80                                                                       |

stable/kubernetes-dashboard/values.yaml

@@ -17,8 +17,8 @@ labels: {}
 ## Additional container arguments
 ##
 # extraArgs:
-#   enable-insecure-login: true
-#   auto-generate-certificates: true
+#   - --enable-insecure-login
+#   - --system-banner="Welcome to Kubernetes"
 
 ## Node labels for pod assignment
 ## Ref: https://kubernetes.io/docs/user-guide/node-selection/