docs/provider: Add .hashibot.hcl changes to New Service checklist

Reference: #10399

.github/CONTRIBUTING.md

@@ -291,6 +291,35 @@ into Terraform.
     `quicksightconn: quicksight.New(sess.Copy(&aws.Config{Endpoint: aws.String(c.Endpoints["quicksight"])})),`
   - In `website/docs/guides/custom-service-endpoints.html.md`: Add the service
     name in the list of customizable endpoints.
+  - In `.hashibot.hcl`: Add the new service to automated issue and pull request labeling. e.g. with the `quicksight` service
+
+  ```hcl
+  behavior "regexp_issue_labeler_v2" "service_labels" {
+    # ... other configuration ...
+
+    label_map = {
+      # ... other services ...
+      "service/quicksight" = [
+        "aws_quicksight_",
+      ],
+      # ... other services ...
+    }
+  }
+
+  behavior "pull_request_path_labeler" "service_labels"
+    # ... other configuration ...
+
+    label_map = {
+      # ... other services ...
+      "service/quicksight" = [
+        "**/*_quicksight_*",
+        "**/quicksight_*",
+      ],
+      # ... other services ...
+    }
+  }
+  ```
+
   - Run the following then submit the pull request:
 
   ```sh