boards/nucleo-f070rb: fix broken links
boards/nucleo-f070rb: fix broken links

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