chore(frontends/lean/parser): update comments
chore(frontends/lean/parser): update comments

johoelzl/lean,digama0/lean,leodemoura/lean,digama0/lean,leodemoura/lean,leanprover-community/lean,rlewis1988/lean,dselsam/lean,fpvandoorn/lean,leanprover-community/lean,leanprover/lean,Kha/lean,fpvandoorn/lean,leanprover-community/lean,fpvandoorn/lean,avigad/lean,leanprover/lean,rlewis1988/lean,Kha/lean,Kha/lean,digama0/lean,leanprover-community/lean,dselsam/lean,johoelzl/lean,leodemoura/lean,avigad/lean,fpvandoorn/lean,dselsam/lean,rlewis1988/lean,digama0/lean,dselsam/lean,avigad/lean,leodemoura/lean,johoelzl/lean,leanprover/lean,avigad/lean,digama0/lean,rlewis1988/lean,fpvandoorn/lean,digama0/lean,johoelzl/lean,leodemoura/lean,Kha/lean,leanprover-community/lean,avigad/lean,rlewis1988/lean,leanprover-community/lean,dselsam/lean,leanprover/lean,dselsam/lean,Kha/lean,leanprover/lean,avigad/lean,Kha/lean,johoelzl/lean,leodemoura/lean,fpvandoorn/lean,leanprover/lean,johoelzl/lean,rlewis1988/lean