Rename `YGMarkerType` to `YGMarker`
Rename `YGMarkerType` to `YGMarker`

Summary:
@public

this will lead to nicer enum member names.

Reviewed By: SidharthGuglani

Differential Revision: D13817587

fbshipit-source-id: 85355328f7977b4fb29a9474532f2d578a3cbf79

exponentjs/react-native,pandiaraj44/react-native,hammerandchisel/react-native,exponent/react-native,arthuralee/react-native,janicduplessis/react-native,hammerandchisel/react-native,hoangpham95/react-native,exponent/react-native,hammerandchisel/react-native,arthuralee/react-native,facebook/react-native,javache/react-native,myntra/react-native,hoangpham95/react-native,myntra/react-native,exponentjs/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,javache/react-native,hoangpham95/react-native,exponent/react-native,pandiaraj44/react-native,janicduplessis/react-native,hoangpham95/react-native,exponentjs/react-native,myntra/react-native,exponentjs/react-native,javache/react-native,hammerandchisel/react-native,facebook/react-native,hammerandchisel/react-native,hammerandchisel/react-native,janicduplessis/react-native,myntra/react-native,pandiaraj44/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,exponent/react-native,exponent/react-native,arthuralee/react-native,facebook/react-native,janicduplessis/react-native,arthuralee/react-native,hammerandchisel/react-native,pandiaraj44/react-native,javache/react-native,hoangpham95/react-native,exponentjs/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,hoangpham95/react-native,myntra/react-native,arthuralee/react-native,hoangpham95/react-native,exponent/react-native,exponentjs/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,hoangpham95/react-native,exponent/react-native,myntra/react-native,exponent/react-native,exponentjs/react-native,janicduplessis/react-native,exponentjs/react-native,facebook/react-native