MB-5307:mention rebalanceMovesBeforeCompaction setting in CHANGES

Change-Id: I75928977953936ee3860a0a56418e180a7680964
Reviewed-on: http://review.couchbase.org/25004
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>