Fix issue #3505, add notes about origin upgrade versions support in BYO upgrade README file

playbooks/byo/openshift-cluster/upgrades/README.md

@@ -4,5 +4,5 @@ cluster. Additional notes for the associated upgrade playbooks are
 provided in their respective directories.
 
 # Upgrades available
-- [OpenShift Enterprise 3.4 to 3.5](v3_5/README.md)
-- [OpenShift Enterprise 3.3 to 3.4](v3_4/README.md)
+- [OpenShift Enterprise 3.4 to 3.5](v3_5/README.md) (works also to upgrade OpenShift origin from 1.4.x to 1.5.x)
+- [OpenShift Enterprise 3.3 to 3.4](v3_4/README.md) (works also to upgrade OpenShift origin from 1.3.x to 1.4.x)