Update helm chart description

data/installation_methods.yml

@@ -6,7 +6,7 @@ official:
   - url: 'http://docs.gitlab.com/ce/install/kubernetes/'
     name: 'Kubernetes'
     logo: '/images/logos/kubernetes-logo.svg'
-    desc: 'Official Helm repository'
+    desc: 'Helm repository for Google Container Engine (GKE), Azure Container Service, and Tectonic'
   - url: '/2016/06/28/get-started-with-openshift-origin-3-and-gitlab'
     name: 'RedHat OpenShift'
     logo: '/images/logos/openshift-logo.svg'