Updated release process documentation after sha checksum and ASF dev dist changes
Updated release process documentation after sha checksum and ASF dev dist changes

 patch by Mick Semb Wever; reviewed by Michael Shuler for CASSANDRA-14970

michaelsembwever/cassandra,instaclustr/cassandra,krummas/cassandra,mike-tr-adamson/cassandra,tjake/cassandra,blambov/cassandra,adejanovski/cassandra,thelastpickle/cassandra,mshuler/cassandra,mike-tr-adamson/cassandra,szhou1234/cassandra,adelapena/cassandra,beobal/cassandra,beobal/cassandra,apache/cassandra,thelastpickle/cassandra,pauloricardomg/cassandra,instaclustr/cassandra,instaclustr/cassandra,apache/cassandra,szhou1234/cassandra,adelapena/cassandra,belliottsmith/cassandra,adelapena/cassandra,adelapena/cassandra,szhou1234/cassandra,beobal/cassandra,snazy/cassandra,snazy/cassandra,blambov/cassandra,beobal/cassandra,instaclustr/cassandra,belliottsmith/cassandra,bdeggleston/cassandra,jeromatron/cassandra,mshuler/cassandra,pauloricardomg/cassandra,pauloricardomg/cassandra,blerer/cassandra,mike-tr-adamson/cassandra,jrwest/cassandra,snazy/cassandra,krummas/cassandra,jasonstack/cassandra,adejanovski/cassandra,driftx/cassandra,apache/cassandra,jeromatron/cassandra,bdeggleston/cassandra,mshuler/cassandra,michaelsembwever/cassandra,adejanovski/cassandra,krummas/cassandra,jrwest/cassandra,mike-tr-adamson/cassandra,jrwest/cassandra,jasonstack/cassandra,tjake/cassandra,bdeggleston/cassandra,pauloricardomg/cassandra,tjake/cassandra,thelastpickle/cassandra,blerer/cassandra,bdeggleston/cassandra,michaelsembwever/cassandra,jrwest/cassandra,szhou1234/cassandra,blambov/cassandra,tjake/cassandra,blerer/cassandra,krummas/cassandra,driftx/cassandra,blambov/cassandra,michaelsembwever/cassandra,snazy/cassandra,blerer/cassandra,driftx/cassandra,driftx/cassandra,belliottsmith/cassandra,jeromatron/cassandra,mshuler/cassandra,apache/cassandra,jasonstack/cassandra,thelastpickle/cassandra,belliottsmith/cassandra