mathlib3

56f2c05e - chore(algebra/regular): rename lemma is_regular_of_cancel_monoid_with_zero to is_regular_of_ne_zero (#6408)

chore(algebra/regular): rename lemma is_regular_of_cancel_monoid_with_zero to is_regular_of_ne_zero (#6408) Change the name of lemma is_regular_of_cancel_monoid_with_zero to the shorter is_regular_of_ne_zero. Zulip reference: https://leanprover.zulipchat.com/#narrow/stream/267928-condensed-mathematics