Doc : document creation of a new service-account-token too.

I think that's all the k8s resources created AFAIK

doc/user/project/clusters/index.md

@@ -189,6 +189,7 @@ RBAC-enabled cluster :
 | ---            | ---                  | ---                               | ---                        |
 | `gitlab`       | `ServiceAccount`     | `default` namespace               | Creating a new GKE Cluster |
 | `gitlab-admin` | `ClusterRoleBinding` | `cluster-admin` roleRef           | Creating a new GKE Cluster |
+| `gitlab-token` | `Secret`             | Token for `gitlab` ServiceAccount | Creating a new GKE Cluster |
 | `tiller`       | `ServiceAccount`     | `gitlab-managed-apps` namespace   | Installing Helm Tiller     |
 | `tiller-admin` | `ClusterRoleBinding` | `cluster-admin` roleRef           | Installing Helm Tiller     |