add reminder to check paths in nginx config

doc/install/installation.md

@@ -476,10 +476,14 @@ Copy the example site config:
     sudo cp lib/support/nginx/gitlab /etc/nginx/sites-available/gitlab
     sudo ln -s /etc/nginx/sites-available/gitlab /etc/nginx/sites-enabled/gitlab
 
-Make sure to edit the config file to match your setup:
+Make sure to edit the config file to match your setup. Also, ensure that you match your paths to GitLab, especially if installing for a user other than the 'git' user:
 
     # Change YOUR_SERVER_FQDN to the fully-qualified
     # domain name of your host serving GitLab.
+    #
+    # Remember to match your paths to GitLab, especially
+    # if installing for a user other than 'git'.
+    #
     # If using Ubuntu default nginx install:
     # either remove the default_server from the listen line
     # or else sudo rm -f /etc/nginx/sites-enabled/default