Update urls to 1.7 (#4276)

* assign-pod-node.md

* secret.md

* kubernetes-objects.md

* service.md

docs/concepts/services-networking/service.md

@@ -10,7 +10,7 @@ redirect_from:
 Kubernetes [`Pods`](/docs/user-guide/pods) are mortal. They are born and when they die, they
 are not resurrected.  [`ReplicationControllers`](/docs/user-guide/replication-controller) in
 particular create and destroy `Pods` dynamically (e.g. when scaling up or down
-or when doing [rolling updates](/docs/user-guide/kubectl/v1.6/#rolling-update)).  While each `Pod` gets its own IP address, even
+or when doing [rolling updates](/docs/user-guide/kubectl/v1.7/#rolling-update)).  While each `Pod` gets its own IP address, even
 those IP addresses cannot be relied upon to be stable over time. This leads to
 a problem: if some set of `Pods` (let's call them backends) provides
 functionality to other `Pods` (let's call them frontends) inside the Kubernetes