drivers/periph/cpuid: Fix typo in doc
drivers/periph/cpuid: Fix typo in doc

ant9000/RIOT,miri64/RIOT,jasonatran/RIOT,miri64/RIOT,authmillenon/RIOT,kaspar030/RIOT,basilfx/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,OTAkeys/RIOT,jasonatran/RIOT,basilfx/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,ant9000/RIOT,jasonatran/RIOT,OTAkeys/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kYc0o/RIOT,authmillenon/RIOT,kYc0o/RIOT,miri64/RIOT,miri64/RIOT,authmillenon/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,ant9000/RIOT,kaspar030/RIOT,basilfx/RIOT,kaspar030/RIOT,kYc0o/RIOT,kYc0o/RIOT,OTAkeys/RIOT,authmillenon/RIOT,miri64/RIOT,authmillenon/RIOT,ant9000/RIOT,kaspar030/RIOT,ant9000/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,jasonatran/RIOT,basilfx/RIOT,basilfx/RIOT