Added statement about zoom functionality

Author: dknappettmsft

articles/virtual-desktop/teams-on-avd.md

@@ -159,6 +159,7 @@ Using Teams in a virtualized environment is different from using Teams in a non-
 - With per-machine installation, Teams on VDI isn't automatically updated the same way non-VDI Teams clients are. To update the client, you'll need to update the VM image by installing a new MSI.
 - Media optimization for Teams is only supported for the Remote Desktop client on machines running Windows 10 or later or macOS 10.14 or later.
 - Use of explicit HTTP proxies defined on the client endpoint device isn't supported.
+- Zoom in/zoom out of chat windows isn't supported.
 
 ### Calls and meetings