Merge branch 'cablett-update-mailroom-docs' into 'master'

Update docs link in mail_room yml section

See merge request gitlab-org/gitlab!81130

config/gitlab.yml.example

@@ -185,7 +185,7 @@ production: &base
 
   ## Reply by email
   # Allow users to comment on issues and merge requests by replying to notification emails.
-  # For documentation on how to set this up, see http://doc.gitlab.com/ce/administration/reply_by_email.html
+  # For documentation on how to set this up, see https://docs.gitlab.com/ee/administration/reply_by_email.html
   incoming_email:
     enabled: false