Fix spelling and grammar errors in tutorial.rst
Fix spelling and grammar errors in tutorial.rst
makerbot/pyusb,AlanJAS/pyusb,rabryan/pyusb,kopchik/pyusb,swinman/pyusb,h3nj3/pyusb,AlanJAS/pyusb,karlp/pyusb,makerbot/pyusb,swinman/pyusb,karlp/pyusb,h3nj3/pyusb,rabryan/pyusb,kopchik/pyusb