Update database/doctrine info with type and exception changes#5957

Merged

rullzer merged 2 commits intomasterfrom

fix/latest-doctrine-upgrade

Jan 15, 2021

Commits on Jan 15, 2021

Recommend our own type constants instead of Doctrine's
ChristophWurst
committed
Add note about the new database exception and the dropped dbal one
ChristophWurst
committed