DOC: regression docstring typos
DOC: regression docstring typos

enigmampc/catalyst,Scapogo/zipline,humdings/zipline,Scapogo/zipline,quantopian/zipline,enigmampc/catalyst,bartosh/zipline,florentchandelier/zipline,alphaBenj/zipline,humdings/zipline,quantopian/zipline,alphaBenj/zipline,florentchandelier/zipline,bartosh/zipline,magne-max/zipline-ja,magne-max/zipline-ja