Fix advanced topics custom block render docs: Remove extra line in default block render map list (#803)
Fix advanced topics custom block render docs: Remove extra line in default block render map list (#803)


TripleDip/draft-js,SciMts/draft-js,facebook/draft-js,johnmpotter/draft-js,dirkholsopple/draft-js,johnmpotter/draft-js,tonygentilcore/draft-js,dirkholsopple/draft-js,SciMts/draft-js,tonygentilcore/draft-js,TripleDip/draft-js