Update backend-setup.md (#4271)
Update backend-setup.md (#4271)


apache/skywalking,ascrutae/sky-walking,ascrutae/sky-walking,apache/skywalking,OpenSkywalking/skywalking,apache/skywalking,apache/skywalking,apache/skywalking,OpenSkywalking/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,ascrutae/sky-walking