doc(install): fixup helm invocations

Author: slack

src/installing-deis/installing-deis-workflow.md

@@ -46,7 +46,8 @@ $ helm fetch deis/deis
 Now that you have Helm installed and added the Deis Chart Repository, install Workflow by running:
 
 ```
-$ helm install deis/deis --namespace=deis
+$ helm generate deis                   # generates various secrets
+$ helm install deis --namespace=deis   # injects resources into your cluster
 ```
 
 Helm will install a variety of Kubernetes resources in the `deis` namespace.