Missing `extern_vault_namespace` setting from automated installation page

[karvounis-form3]

Context

In TFE version v202205-1, there is a known issue regarding the VAULT NAMESPACE. It proved to be a nasty one for us while deploying that version recently.
The proposed resolution in the docs is to execute tfe-admin app-config -k extern_vault_namespace -v 'root' and restart. However, this could be also automated by adding the below configuration in the TFE configuration JSON file:

   ...
    "extern_vault_namespace": {
        "value": "root"
    },
   ...

Resolution

In order to make the above solution more explicit, I would suggest to add the extern_vault_namespace setting and its description to the page that contains the list of available-settings. This would make it more transparent and explicit and could benefit a lot of people in their automation process.