add more description

Author: shihying

src/ResourceManager/AnalysisServices/ChangeLog.md

@@ -19,7 +19,9 @@
 -->
 ## Current Release
 * Added State property in additional to ProvisioningState
-    - This introduces new property used outside of provisioing.
+    - All the cmdlet returning AnalysisService would have a new property 'State' used outside of provisioing.
+    - The 'State' is intended to check status outside of provisioning, while 'ProvisioningState' is intended to check status related to Provisioning.
+    - ProvisioningState and State are same in service side at this moment, the service side would differenciate ProvisioningState and State in future
 
 ## Version 0.0.3
 * Added two new dataplane APIs in a separate module Azure.AnalysisServices.psd1