Update index.mdx

Remove reference 'kubernetes-supported-versions.mdx' from helm

Author: ram-parameswaran

content/vault/v1.18.x/content/docs/platform/k8s/helm/index.mdx

@@ -19,8 +19,6 @@ This page assumes general knowledge of [Helm](https://helm.sh/) and
 how to use it. Using Helm to install Vault requires that Helm is
 properly installed and configured with your Kubernetes cluster.
 
-@include 'kubernetes-supported-versions.mdx'
-
 ## Using the helm chart
 
 Helm must be installed and configured on your machine. Please refer to the [Helm