* Remove static optimization from message
This check does not pertain to automatic static optimization.
Closes https://github.com/zeit/next.js/issues/9042
* Update help message
* Add handling for invalid pages during autoExport
* Add err.sh link for invalid page export
* Fix typo
* Apply suggestions from code review
Co-Authored-By: Tim Neutkens <tim@timneutkens.nl>