boards/msba2: fix broken links
boards/msba2: fix broken links

miri64/RIOT,kaspar030/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,ant9000/RIOT,authmillenon/RIOT,ant9000/RIOT,OlegHahm/RIOT,basilfx/RIOT,OTAkeys/RIOT,jasonatran/RIOT,kYc0o/RIOT,authmillenon/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kaspar030/RIOT,basilfx/RIOT,OlegHahm/RIOT,authmillenon/RIOT,yogo1212/RIOT,kYc0o/RIOT,jasonatran/RIOT,kaspar030/RIOT,ant9000/RIOT,basilfx/RIOT,RIOT-OS/RIOT,ant9000/RIOT,basilfx/RIOT,basilfx/RIOT,miri64/RIOT,jasonatran/RIOT,authmillenon/RIOT,yogo1212/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,kYc0o/RIOT,kYc0o/RIOT,ant9000/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,jasonatran/RIOT,authmillenon/RIOT,yogo1212/RIOT,miri64/RIOT,yogo1212/RIOT,authmillenon/RIOT,miri64/RIOT,kYc0o/RIOT,miri64/RIOT,RIOT-OS/RIOT