ON-16107: document upgrade-from-8 driverlink unload fix

src/onload/distfiles/ChangeLog

@@ -14,6 +14,7 @@ ON-15830: remove support for out-of-tree aux bus
 ON-15852: use unbound work queue
 ON-16018: add sfcaffinity_config support for ecores
 ON-16076: X3: don't restrict EF_SHARED_RXQ_NUM to first 8 queues.
+ON-16107: use rmmod to remove sfc_driverlink, fixing issue upgrading from < 9.0
 ON-16130: drop aux bus handle on device unplug, avoiding kernel crash
 ON-16132: rpm, deb: detect cplane user/group error and fail installation early
 ON-16144: fix race in VI allocation over aux bus, avoiding kernel crash