Update help for nbgrader autograde
Update help for nbgrader autograde

ellisonbg/nbgrader,dementrock/nbgrader,ellisonbg/nbgrader,jhamrick/nbgrader,jhamrick/nbgrader,EdwardJKim/nbgrader,jhamrick/nbgrader,modulexcite/nbgrader,MatKallada/nbgrader,ellisonbg/nbgrader,EdwardJKim/nbgrader,EdwardJKim/nbgrader,jupyter/nbgrader,dementrock/nbgrader,alope107/nbgrader,jupyter/nbgrader,modulexcite/nbgrader,alope107/nbgrader,MatKallada/nbgrader,jdfreder/nbgrader,jupyter/nbgrader,jupyter/nbgrader,jhamrick/nbgrader,jdfreder/nbgrader,jupyter/nbgrader,ellisonbg/nbgrader,EdwardJKim/nbgrader