openocd: Add instructions for overriding OPENOCD
openocd: Add instructions for overriding OPENOCD

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