remove mention of Github-flavored-markdown since that feature was removed in e53a2be
remove mention of Github-flavored-markdown since that feature was removed in e53a2be

tbremer/docco,whitetrefoil/docco,osharim/docco,mhkeller/docco,gvithellyna/docco,JonathanMatthey/codeconv,STRd6/docco,Hellyna/docco,guigrpa/docco-extended,lobrien/docco,whitetrefoil/docco,gvithellyna/docco,guigrpa/docco,MaxwellRebo/docco,lbn/docco,tbremer/docco,DoomHammer/docco,ShawnHuang/docco-multidir,erikdiessel/plidoc,robertmackenzie/docco,oponder/docco,guigrpa/docco,mhkeller/docco,oponder/docco,DoomHammer/docco,jalleyne/docco,Hellyna/docco,ShawnHuang/docco-multidir,jrvidal/docco,lobrien/docco,actano/docco,robertmackenzie/docco,MaxwellRebo/docco,jrvidal/docco,erikdiessel/plidoc,osharim/docco,guigrpa/docco-extended,HubSpot/docco,lbn/docco,jalleyne/docco