Add example of exceptions on attribute access to docs
Add example of exceptions on attribute access to docs

derwiki-adroll/mock,sorenh/mock,testing-cabal/mock,pypingou/mock,dannybtran/mock,johndeng/mock,OddBloke/mock,scorphus/mock,frankier/mock,kostyll/mock,nett55/mock,lord63-forks/mock,rbtcollins/mock,fladi/mock