Clarify supported object storage for Terraform

doc/administration/terraform_state.md

@@ -52,8 +52,8 @@ below.
 
 ## Using object storage **(CORE ONLY)**
 
-Instead of storing Terraform state files on disk, we recommend the use of an object
-store that is S3-compatible instead. This configuration relies on valid credentials to
+Instead of storing Terraform state files on disk, we recommend the use of [one of the supported object
+storage options](object_storage.md#options). This configuration relies on valid credentials to
 be configured already.
 
 [Read more about using object storage with GitLab](object_storage.md).