drivers/apa102: fix typos
drivers/apa102: fix typos

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