Merge pull request #4371 from michelleN/docs

ref(docs): update docs around rbac

docs/install.md

@@ -131,6 +131,7 @@ You can explicitly tell `helm init` to...
 - Install a particular image (version) with `--tiller-image`
 - Install to a particular cluster with `--kube-context`
 - Install into a particular namespace with `--tiller-namespace`
+- Install Tiller with a Service Account with `--service-account` (for [RBAC enabled clusters](securing_installation.md#rbac))
 
 Once Tiller is installed, running `helm version` should show you both
 the client and server version. (If it shows only the client version,

docs/rbac.md

@@ -14,11 +14,6 @@ Once you have satisfied the pre-requisite and have a service account with the co
 
 ### Example: Service account with cluster-admin role
 
-```console
-$ kubectl create serviceaccount tiller --namespace kube-system
-serviceaccount "tiller" created
-```
-
 In `rbac-config.yaml`:
 
 ```yaml