chore(algebra/group/basic): rename type vars (#1989)
chore(algebra/group/basic): rename type vars (#1989)

Co-authored-by: mergify[bot] <b09a6ee808b67e98a221404e7aaa52e0398a4954@users.noreply.github.com>

leanprover-community/mathlib,leanprover-community/mathlib