Update RELEASE_NOTES.md for 1.9.7 release

Author: ninjarobot

Diff for: RELEASE_NOTES.md

@@ -1,14 +1,11 @@
 Release Notes
 =============
-## vNext
-- Support gallery references for VMs (`operating_system`)
-- Support for VM/VMSS security profile options (#1163)
-
-## 1.9.7
-- AKS Cluster: support for Sku and Tier. Support for pod subnet in agent pool config. Support for node pool autoscaling
 
 ## 1.9.7
+* AKS Cluster: support for Sku and Tier. Support for pod subnet in agent pool config. Support for node pool autoscaling
 * CosmosDB: Add support for Gremlin Graphs
+* Virtual Machines: Support gallery references for VMs (`operating_system`)
+* Virtual Machines and VMSS: Support for security profile options (#1163)
 
 ## 1.9.6
 - Network Interface: Support for adding Network Security Group (NSG) to Network Interface (NIC)