Update train_autopilot.md (#131)
Update train_autopilot.md (#131)

Fixing spelling mistake.
wroscoe/donkey,wroscoe/donkey,kennethjiang/donkey,wroscoe/donkey,ricorx7/donkey,ricorx7/donkey,alanwells/donkey,kennethjiang/donkey,alanwells/donkey,ricorx7/donkey,ricorx7/donkey,kennethjiang/donkey,alanwells/donkey,wroscoe/donkey