Docs: update pre-requirements after test on clean Ubuntu
Docs: update pre-requirements after test on clean Ubuntu

srfraser/services,garbas/mozilla-releng-services,srfraser/services,lundjordan/services,garbas/mozilla-releng-services,lundjordan/services,andrei987/services,srfraser/services,mozilla-releng/services,mozilla-releng/services,andrei987/services,andrei987/services,garbas/mozilla-releng-services,andrei987/services,mozilla-releng/services,mozilla-releng/services,La0/mozilla-relengapi,garbas/mozilla-releng-services,lundjordan/services,srfraser/services,lundjordan/services,La0/mozilla-relengapi,La0/mozilla-relengapi,La0/mozilla-relengapi