fixup! fixup! affected different parameter approach in documentation

Co-authored-by: Martin Grossmann <martin@vyvoj.net>

docs/introduction/running-acceptance-tests.md

@@ -10,7 +10,7 @@ docker exec -it shopsys-framework-php-fpm bash
 
 !!! note
     For `selenium-server` to be able to connect to you `webserver` container and access your application, all domains should have URL set to `http://webserver:8000`.
-    This is done via parameter `%overwrite_domain_url%` defined in `.env.test` or `.env.test.local`.
+    This is done via parameter `OVERWRITE_DOMAIN_URL` defined in `.env.test` or `.env.test.local`.
     Everything should be configured for you by default but it is important to keep the domain URL overwriting in mind when dealing with acceptance tests.
 
 If you are logged into your `php-fpm` container and have the `%overwrite_domain_url%` parameter properly set,