boards/sltb001a: update documentation
boards/sltb001a: update documentation

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