[ticket/11570] Add link back to update process

PHPBB3-11570
[ticket/11570] Fix link and make the notice more conspiciuous

PHPBB3-11570
Merge remote-tracking branch 'Elsensee/ticket/11570' into develop

* Elsensee/ticket/11570:
  [ticket/11570] Fix link and make the notice more conspiciuous
  [ticket/11570] Add link back to update process