Address feedback

Author: detiber

docs/proposals/20191017-control-plane.md

@@ -359,7 +359,7 @@ And the following defaulting:
   selector:
     matchLabels:
       cluster.x-k8s.io/cluster-name: my-cluster
-      cluster.x-k8s.io/control-plane: "true"
+      cluster.x-k8s.io/control-plane: ""
 ```
 
 - Generate CA certificates if they do not exist
@@ -374,9 +374,9 @@ metadata:
   name: my-cluster
   namespace: default
 spec:
-    clusterNetwork:
-      pods:
-        cidrBlocks: ["192.168.0.0/16"]
+  clusterNetwork:
+    pods:
+      cidrBlocks: ["192.168.0.0/16"]
   controlPlaneRef:
     kind: KubeadmControlPlane
     apiVersion: cluster.x-k8s.io/v1alpha3