Getting-started-guide cleanup.

Put a Prerequisites section in all the hosted gettting-started-guides.
Change how title and contents are formatted so they are not automatically
included in the ToC.  Tweak other section headers to improve ToCs.

docs/getting-started-guides/gce.md

@@ -1,23 +1,22 @@
-
-## Getting started on Google Compute Engine
+Getting started on Google Compute Engine
+----------------------------------------
 
 **Table of Contents**
 
-    - [Getting started on Google Compute Engine](#getting-started-on-google-compute-engine)
-        - [Before you start](#before-you-start)
-        - [Prerequisites](#prerequisites)
-        - [Starting a cluster](#starting-a-cluster)
-        - [Installing the kubernetes command line tools on your workstation](#installing-the-kubernetes-command-line-tools-on-your-workstation)
-        - [Getting started with your cluster](#getting-started-with-your-cluster)
-            - [Inspect your cluster](#inspect-your-cluster)
-            - [Run some examples](#run-some-examples)
-        - [Tearing down the cluster](#tearing-down-the-cluster)
-        - [Customizing](#customizing)
-        - [Troubleshooting](#troubleshooting)
-            - [Project settings](#project-settings)
-            - [Cluster initialization hang](#cluster-initialization-hang)
-            - [SSH](#ssh)
-            - [Networking](#networking)
+    - [Before you start](#before-you-start)
+    - [Prerequisites](#prerequisites)
+    - [Starting a cluster](#starting-a-cluster)
+    - [Installing the kubernetes command line tools on your workstation](#installing-the-kubernetes-command-line-tools-on-your-workstation)
+    - [Getting started with your cluster](#getting-started-with-your-cluster)
+        - [Inspect your cluster](#inspect-your-cluster)
+        - [Run some examples](#run-some-examples)
+    - [Tearing down the cluster](#tearing-down-the-cluster)
+    - [Customizing](#customizing)
+    - [Troubleshooting](#troubleshooting)
+        - [Project settings](#project-settings)
+        - [Cluster initialization hang](#cluster-initialization-hang)
+        - [SSH](#ssh)
+        - [Networking](#networking)
 
 
 The example below creates a Kubernetes cluster with 4 worker node Virtual Machines and a master Virtual Machine (i.e. 5 VMs in your cluster). This cluster is set up and controlled from your workstation (or wherever you find convenient).