fix google_project_service docs to mention it supports user project o…

…verrides (#5036)

mmv1/third_party/terraform/website/docs/r/google_project_service.html.markdown

@@ -70,3 +70,9 @@ $ terraform import google_project_service.my_project your-project-id/iam.googlea
 ```
 
 Note that unlike other resources that fail if they already exist, `terraform apply` can be successfully used to verify already enabled services. This means that when importing existing resources into Terraform, you can either import the `google_project_service` resources or treat them as new infrastructure and run `terraform apply` to add them to state.
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+
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+## User Project Overrides
+
+This resource supports [User Project Overrides](https://www.terraform.io/docs/providers/google/guides/provider_reference.html#user_project_override).