eefa4a7333
This commit replaces the 5.4-to-5.5 upgrade guide with the 5.4-to-6.0 upgrade guide, including the metrics update information. The guide references the "Enable Consistent Topology Updates" document, as enabling consistent topology updates is a new step when upgrading to version 6.0. Also, a procedure for image upgrades has been added (as verified by @yaronkaikov). Fixes scylladb/scylladb#18254 Fixes scylladb/scylladb#17896 Refs scylladb/scylladb#18580 Closes scylladb/scylladb#18728