add some help info about the 'all' arg

pkg/kubectl/cmd/cmd.go

@@ -170,6 +170,7 @@ __custom_func() {
 	// TODO: This should be populated using the discovery information from apiserver.
 	valid_resources = `Valid resource types include:
 
+    * all
     * clusters (valid only for federation apiservers)
     * componentstatuses (aka 'cs')
     * configmaps (aka 'cm')

pkg/kubectl/cmd/get.go

@@ -77,7 +77,10 @@ var (
 		kubectl get rc,services
 
 		# List one or more resources by their type and names.
-		kubectl get rc/web service/frontend pods/web-pod-13je7`)
+		kubectl get rc/web service/frontend pods/web-pod-13je7
+
+		# List all resources with different types.
+		kubectl get all`)
 )
 
 // NewCmdGet creates a command object for the generic "get" action, which