refactor(library/algebra/ring): use rewrite tactic at ring module
refactor(library/algebra/ring): use rewrite tactic at ring module

digama0/lean,soonhokong/lean-osx,sp3ctum/lean,rlewis1988/lean,avigad/lean,avigad/lean,soonhokong/lean-windows,soonhokong/lean-windows,c-cube/lean,leodemoura/lean,johoelzl/lean,levnach/lean,johoelzl/lean,johoelzl/lean,UlrikBuchholtz/lean,htzh/lean,UlrikBuchholtz/lean,fpvandoorn/lean,digama0/lean,Kha/lean,soonhokong/lean,johoelzl/lean,htzh/lean,eigengrau/lean,rlewis1988/lean,soonhokong/lean-osx,leodemoura/lean,dselsam/lean,leodemoura/lean,eigengrau/lean,htzh/lean,htzh/lean,leanprover/lean,c-cube/lean,eigengrau/lean,soonhokong/lean,fpvandoorn/lean,javra/lean,digama0/lean,leodemoura/lean,fpvandoorn/lean2,fpvandoorn/lean2,sp3ctum/lean,soonhokong/lean-windows,fpvandoorn/lean,dselsam/lean,leodemoura/lean,leanprover-community/lean,sp3ctum/lean,levnach/lean,Kha/lean,fpvandoorn/lean2,levnach/lean,avigad/lean,leanprover/lean,digama0/lean,dselsam/lean,soonhokong/lean-windows,rlewis1988/lean,soonhokong/lean,Kha/lean,leanprover-community/lean,javra/lean,UlrikBuchholtz/lean,dselsam/lean,fpvandoorn/lean,javra/lean,Kha/lean,c-cube/lean,soonhokong/lean,dselsam/lean,rlewis1988/lean,Kha/lean,fgdorais/lean,leanprover/lean,leanprover/lean,javra/lean,Kha/lean,leanprover-community/lean,johoelzl/lean,leanprover-community/lean,eigengrau/lean,soonhokong/lean-windows,avigad/lean,soonhokong/lean,levnach/lean,c-cube/lean,rlewis1988/lean,soonhokong/lean-osx,fgdorais/lean,fpvandoorn/lean,avigad/lean,soonhokong/lean-osx,dselsam/lean,digama0/lean,sp3ctum/lean,leanprover/lean,soonhokong/lean-osx,c-cube/lean,levnach/lean,htzh/lean,UlrikBuchholtz/lean,leanprover-community/lean,javra/lean,johoelzl/lean,leanprover/lean,avigad/lean,leodemoura/lean,fpvandoorn/lean,fgdorais/lean,UlrikBuchholtz/lean,fgdorais/lean,leanprover-community/lean,rlewis1988/lean,fpvandoorn/lean2,eigengrau/lean,fgdorais/lean,digama0/lean,sp3ctum/lean,fgdorais/lean,fpvandoorn/lean2