Remove unnecessary sphinx docs build for 2.7 (only need to test the docs build on one version of Python)
Remove unnecessary sphinx docs build for 2.7 (only need to test the docs build on one version of Python)

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