Merge branch 'update-qa-docs-with-directory-req' into 'master'

Add note about needing to be in the `$gdk/gitlab/qa` directory for `bin/qa` to work properly

See merge request gitlab-org/gitlab-ce!16824

[ci skip]

qa/README.md

@@ -34,6 +34,9 @@ You can use GitLab QA to exercise tests on any live instance! For example, the
 following call would login to a local [GDK] instance and run all specs in
 `qa/specs/features`:
 
+First, `cd` into the `$gdk/gitlab/qa` directory.
+The `bin/qa` script expects you to be in the `qa` folder of the app.
+
 ```
 bin/qa Test::Instance http://localhost:3000
 ```