fix "manifold"->"many-fold" typo
fix "manifold"->"many-fold" typo

sbc100/yapf,nikolamilosevic86/yapf,sbc100/yapf,google/yapf,dmoliveira/yapf,elviswf/yapf,jamesblunt/yapf,lucius-feng/yapf,hayd/yapf,abduld/yapf,bygloam/yapf,thurday/yapf,google/yapf,wklken/yapf,ambv/yapf