sam0_common/usb: fix typo in comment
sam0_common/usb: fix typo in comment

toonst/RIOT,authmillenon/RIOT,OlegHahm/RIOT,toonst/RIOT,josephnoir/RIOT,kYc0o/RIOT,yogo1212/RIOT,x3ro/RIOT,josephnoir/RIOT,ant9000/RIOT,x3ro/RIOT,toonst/RIOT,kaspar030/RIOT,toonst/RIOT,ant9000/RIOT,basilfx/RIOT,authmillenon/RIOT,kaspar030/RIOT,ant9000/RIOT,miri64/RIOT,jasonatran/RIOT,kaspar030/RIOT,smlng/RIOT,kaspar030/RIOT,smlng/RIOT,kYc0o/RIOT,jasonatran/RIOT,mtausig/RIOT,ant9000/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,miri64/RIOT,RIOT-OS/RIOT,mtausig/RIOT,yogo1212/RIOT,OlegHahm/RIOT,yogo1212/RIOT,authmillenon/RIOT,ant9000/RIOT,josephnoir/RIOT,miri64/RIOT,aeneby/RIOT,yogo1212/RIOT,josephnoir/RIOT,mtausig/RIOT,OTAkeys/RIOT,basilfx/RIOT,kYc0o/RIOT,smlng/RIOT,OlegHahm/RIOT,miri64/RIOT,aeneby/RIOT,basilfx/RIOT,aeneby/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,kaspar030/RIOT,jasonatran/RIOT,kYc0o/RIOT,jasonatran/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,x3ro/RIOT,mtausig/RIOT,x3ro/RIOT,jasonatran/RIOT,OlegHahm/RIOT,authmillenon/RIOT,x3ro/RIOT,toonst/RIOT,kYc0o/RIOT,aeneby/RIOT,authmillenon/RIOT,josephnoir/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,basilfx/RIOT,miri64/RIOT,OlegHahm/RIOT,mtausig/RIOT,smlng/RIOT,smlng/RIOT,aeneby/RIOT,basilfx/RIOT