This commit adds an upgrade guide from ScyllDB 6.0 to ScyllaDB Enterprise 2024.2. Fixes https://github.com/scylladb/scylladb/issues/20063 Fixes https://github.com/scylladb/scylladb/issues/20062 Refs https://github.com/scylladb/scylla-enterprise/issues/4544 Closes scylladb/scylladb#20133