fix heading

Author: gilesknap

docs/reference/helm.md

@@ -5,7 +5,7 @@ At DLS we use helm charts in our services repos to describe our IOC instances. H
 
 You are not required to use ArgoCD, you can use Helm directly if you prefer. This page discusses how to use the command line tool `ec` to deploy and manage IOC instances using Helm directly. `ec` adds some useful version management features to the workflow that to some extent replicates ArgoCD's ability to track versions.
 
-### TODO this is WIP
+## TODO this is WIP
 
 If you set the `EC_CLI_BACKEND` environment variable to `K8S` then `ec` will use Helm directly to deploy and manage IOC instances. You can get a feel for the commands available with `ec --help`.