undo extra line in partial

Author: paigecalvert

docs/partials/proxy-service/_step-rewrite-helm-values.mdx

@@ -6,7 +6,7 @@ For each image reference in your Helm chart values file, set the image repositor
     * `DOMAIN` is either `proxy.replicated.com` or your custom domain.
     * `APP_SLUG` is the unique slug of your application.
     * `EXTERNAL_REGISTRY_IMAGE_URL` is the path to the private image on your external registry.
-
+    
     **Example:**
 
     ```yaml