documentation for the resource group to use for the azurerm_app_service_certificate

[scott-doyland-burrows]

This updates the documentation for the azurerm_app_service_certificate resource in file website/docs/r/app_service_certificate.html.markdown

The resource_group_name used must be the same as that which the app service plan is defined in.

If the same resource_group_name is not used then terraform will show a successful apply, however the certificate will not be accessible by the app services (and later binding to the certificate will fail).

Also - the certificate will not show in the portal but will show via az webapp config ssl list.

NOTE1 Terraform (or rather the Azure API) behaves differently than the portal. It is possible via the portal to defne/import the certificate into any app service in any resource group and the certificate is then available to all app services - the portal must do some extra "under the covers" work that the API does not.

NOTE2 The various terraform code in the repo has been auto-formatted via terraform fmt hence the large number of formatting changes.

[manicminer]

@scott-doyland-burrows Thanks for the docs fix and for tidying up the examples. Hopefully this does not cause too may merge conflicts in other open PRs, but this LGTM 👍

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