fix(12): typos, wording
fix(12): typos, wording
soonhokong/lean-tutorial,avigad/tutorial,fpvandoorn/tutorial,avigad/tutorial,Hodapp87/cs6460_project,avigad/tutorial,fpvandoorn/tutorial,leanprover/tutorial,leanprover/tutorial,leanprover/tutorial,soonhokong/lean-tutorial,Hodapp87/cs6460_project,fpvandoorn/tutorial,soonhokong/lean-tutorial,Hodapp87/cs6460_project