Update helm-image-registry.mdx

Author: paigecalvert

docs/vendor/helm-image-registry.mdx

@@ -36,7 +36,7 @@ To use the Replicated proxy registry for applications installed with Helm:
         image:
           # proxy.replicated.com or your custom domain
           registry: proxy.replicated.com
-          repository: proxy/ghcr.io/cloudnative-pg/cloudnative-pg
+          repository: proxy/your-app/ghcr.io/cloudnative-pg/cloudnative-pg
           tag: catalog-1.24.0
       ```