cpu/atmega328p: fix typos
cpu/atmega328p: fix typos

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