This commit fixes the information about
Raft-based consistent cluster management
in the 5.2-to-5.4 upgrade guide.
This a follow-up to https://github.com/scylladb/scylladb/pull/15880 and must be backported to branch-5.4.
In addition, it adds information about removing
DateTieredCompactionStrategy to the 5.2-to-5.4
upgrade guide, including the guideline to
migrate to TimeWindowCompactionStrategy.
Closes scylladb/scylladb#15988
(cherry picked from commit ca0f5f39b5)