Switch over to CNG chart short description

doc/install/kubernetes/gitlab_chart.md

@@ -3,4 +3,4 @@
 
 The cloud native `gitlab` chart is the next generation Helm chart, currently in alpha, and will replace the [`gitlab-omnibus`](gitlab_omnibus.md) chart. It will support large deployments with horizontal scaling of individual GitLab components.
 
-Installation instructions and known issues are available at the [project page](https://gitlab.com/charts/helm.gitlab.io/).
+Installation instructions and known issues during alpha are available at the [project page](https://gitlab.com/charts/helm.gitlab.io/).
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