fix(11): improve wording
fix(11): improve wording

The usage of "making ... manifest" is a bit awkward, and using both "begin/end pairs" and "begin...end blocks" in the same sentence is inconsistent.
Hodapp87/cs6460_project,soonhokong/lean-tutorial,fpvandoorn/tutorial,fpvandoorn/tutorial,leanprover/tutorial,leanprover/tutorial,fpvandoorn/tutorial,soonhokong/lean-tutorial,avigad/tutorial,soonhokong/lean-tutorial,Hodapp87/cs6460_project,avigad/tutorial,avigad/tutorial,Hodapp87/cs6460_project,leanprover/tutorial