Merge branch 'pjphillips-master-patch-52383' into 'master'

Update index.md to make it clearer that both config files need to be updated...

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166620



Merged-by: Aleksei Lipniagov <alipniagov@gitlab.com>
Approved-by: Roy Zwambag <rzwambag@gitlab.com>
Approved-by: Aleksei Lipniagov <alipniagov@gitlab.com>
Reviewed-by: Aleksei Lipniagov <alipniagov@gitlab.com>
Co-authored-by: Paul Phillips <pjphillips@gitlab.com>