Update the release doc, add clean part (#6684)
Update the release doc, add clean part (#6684)


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