Add warning to gitlab.yml related to gzip assets and relative links.

config/gitlab.yml.example

@@ -31,6 +31,7 @@ production: &base
     # 2) In your gitlab.yml file: relative_url_root: /gitlab
     # 3) In your unicorn.rb: ENV['RAILS_RELATIVE_URL_ROOT'] = "/gitlab"
     # 4) In ../gitlab-shell/config.yml: gitlab_url: "http://127.0.0.1/gitlab"
+    # 5) In lib/support/nginx/gitlab : do not use asset gzipping, remove block starting with "location ~ ^/(assets)/"
     # To update the path, run: sudo -u git -H bundle exec rake assets:precompile RAILS_ENV=production
     #
     # relative_url_root: /gitlab