s/rc/deployment in expose command in Quick Start

According to
http://kubernetes.io/docs/user-guide/docker-cli-to-kubectl/, since
version 1.2, `run` creates a deployment rather than a replication
controller

docs/user-guide/quick-start.md

@@ -25,7 +25,7 @@ deployment "my-nginx" created
 To expose your service to the public internet, run:
 
 ```shell
-$ kubectl expose rc my-nginx --target-port=80 --type=LoadBalancer
+$ kubectl expose deployment my-nginx --target-port=80 --type=LoadBalancer
 service "my-nginx" exposed
 ```