Added link to JS test example (#2945)

* Added link to JS test example

* Update docs/api/rest_api/rest_api_usage/rest_responses.md

---------

Co-authored-by: Tomasz Dąbrowski <[email protected]>

Author: reithor

docs/api/rest_api/rest_api_usage/rest_responses.md

@@ -149,7 +149,7 @@ The CORS bundle adds an `Access-Control-Allow-Origin` header to the response.
 
 To enable CORS, add regular expression for an allowed domain using the `.env` variable `CORS_ALLOW_ORIGIN`.
 
-For example, to allow the JS test above to be executed alongside this page, you could add the following to an `.env` file (like the `.env.local`): `CORS_ALLOW_ORIGIN=^https?://doc.ibexa.co`.
+For example, to allow the [JS test](testing_rest_api.md#js) to be executed alongside this page, you could add the following to an `.env` file (like the `.env.local`): `CORS_ALLOW_ORIGIN=^https?://doc.ibexa.co`.
 
 To add several domains, filter on URIs, or change the default (like not allowing all the methods), refer to [NelmioCorsBundle Configuration Documentation](https://symfony.com/bundles/NelmioCorsBundle/current/index.html#configuration) to learn how to edit `config/packages/nelmio_cors.yaml`.