Minor update to unittest test discovery in docs.
Minor update to unittest test discovery in docs.

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