Change the slack joining guidance. (#7512)
Change the slack joining guidance. (#7512)


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