boards/cc2650stk: Fix units & alignment in doc
boards/cc2650stk: Fix units & alignment in doc

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