AVD added note for Windows 7 support ended

Author: dknappettmsft

articles/virtual-desktop/prerequisites.md

@@ -99,6 +99,9 @@ You have a choice of operating systems that you can use for session hosts to pro
 
 > [!IMPORTANT]
 > - Azure Virtual Desktop doesn't support 32-bit operating systems or SKUs not listed in the previous table.
+>
+> - Support for Windows 7 ended on January 10, 2023.
+>
 > - [Ephemeral OS disks for Azure VMs](../virtual-machines/ephemeral-os-disks.md) are not supported.
 
 You can use operating system images provided by Microsoft in the [Azure Marketplace](https://azuremarketplace.microsoft.com), or your own custom images stored in an Azure Compute Gallery, as a managed image, or storage blob. To learn more about how to create custom images, see:

articles/virtual-desktop/users/connect-windows.md

@@ -27,6 +27,9 @@ Before you can access your resources, you'll need to meet the prerequisites:
   - Windows Server 2019
   - Windows Server 2016
   - Windows Server 2012 R2
+   
+   > [!IMPORTANT]
+   > Support for Windows 7 ended on January 10, 2023.
 
 - Download the Remote Desktop client installer, choosing the correct version for your device:
   - [Windows 64-bit](https://go.microsoft.com/fwlink/?linkid=2068602) *(most common)*