small changes to intro ipynb
small changes to intro ipynb

eayoungs/eppy,pachi/eppy,santoshphilip/eppy,eayoungs/eppy,jamiebull1/eppy,pachi/eppy,santoshphilip/eppy,jamiebull1/eppy,eayoungs/eppy,santoshphilip/eppy,pachi/eppy,jamiebull1/eppy