doc: Change to github libunwind/libunwind img
doc: Change to github libunwind/libunwind img

libunwind/libunwind,yuyichao/libunwind,libunwind/libunwind,rantala/libunwind,frida/libunwind,rantala/libunwind,djwatson/libunwind,vtjnash/libunwind,djwatson/libunwind,rantala/libunwind,vtjnash/libunwind,unkadoug/libunwind,libunwind/libunwind,unkadoug/libunwind,yuyichao/libunwind,yuyichao/libunwind,frida/libunwind,vtjnash/libunwind,frida/libunwind,djwatson/libunwind,unkadoug/libunwind