Update gce.md (kubernetes#4858)

* Update gce.md

fix bad url

* Update gce.md

fix bad url and use the relative URLs

docs/getting-started-guides/gce.md

@@ -46,7 +46,7 @@ wget -q -O - https://get.k8s.io | bash
 
 Once this command completes, you will have a master VM and four worker VMs, running as a Kubernetes cluster.
 
-By default, some containers will already be running on your cluster. Containers like `fluentd` provide [logging](/docs/user-guide/logging/overview), while `heapster` provides [monitoring](http://releases.k8s.io/{{page.githubbranch}}/cluster/addons/cluster-monitoring/README.md) services.
+By default, some containers will already be running on your cluster. Containers like `fluentd` provide [logging](/docs/concepts/cluster-administration/logging/), while `heapster` provides [monitoring](http://releases.k8s.io/{{page.githubbranch}}/cluster/addons/cluster-monitoring/README.md) services.
 
 The script run by the commands above creates a cluster with the name/prefix "kubernetes". It defines one specific cluster config, so you can't run it more than once.