Update Get-CsOnlineUser.md

Author: isrumnon

skype/skype-ps/skype/Get-CsOnlineUser.md

@@ -229,6 +229,14 @@ FeatureTypes – Array of unique strings specifying what features are enabled fo
 
 LdapFilter has been deprecated due to low usage
 
+*Changes in "-Filter" parameter*
+- Assigned Plan filter - Previous format will no longer be supported. Existing filters like AssignedPlan eq '<some-xml-string>' will stop working. This will need to be modified to one of the below formats
+  - AssignedPlans eq 'MCOEV' - For exact match
+  - AssignedPlans eq '*MCO*' - for contains checks.
+ 
+- EnterpriseVoiceEnabled filter
+  - EnterpriseVoiceEnabled eq true / false
+
 
 ## PARAMETERS