Updated path to `gitlab.yml` config file in the FE FAQ

doc/development/fe_guide/frontend_faq.md

@@ -157,7 +157,7 @@ export const fetchFoos = ({ state }) => {
 Sometimes it's necessary to test locally what the frontend production build would produce, to do so the steps are:
 
 1. Stop webpack: `gdk stop webpack`.
-1. Open `gitlab.yaml` located in your `gitlab` installation folder, scroll down to the `webpack` section and change `dev_server` to `enabled: false`.
+1. Open `gitlab.yaml` located in `gitlab/config` folder, scroll down to the `webpack` section, and change `dev_server` to `enabled: false`.
 1. Run `yarn webpack-prod && gdk restart rails-web`.
 
 The production build takes a few minutes to be completed. Any code changes at this point are