A while back `atlas_artifact` was switched from being a `resource` to a `data` provider. When you use the examples suggested in the Terraform Enterprise docs, the Terraform cli shows a deprecation warning and provides an old url to the new data provider docs.
There are some complimentary doc updates in the Terraform Enterprise/Atlas repo.
* small doc update
* provider/atlas: Add docs for Artifact Data Source
* provider/atlas: Remove a test method that isn't used
* provider/atlas: Add Data Source for Atlas Artifact
* provider/atlas: Show deprecation error on atlas_artifact resource