Update active-directory-cloud-sync-how-to-install.md - Add US Gov Note step 6

Added note and link to highlight install needs switch for US Gov Cloud. Otherwise it's not known until trying to auth to Azure and not connecting to the right endpoints.

Author: JCoreMS

includes/active-directory-cloud-sync-how-to-install.md

@@ -22,6 +22,10 @@ ms.custom: include file
  :::image type="content" source="media/active-directory-cloud-sync-how-to-install/new-ux-2.png" alt-text="Screenshot of download agent." lightbox="media/active-directory-cloud-sync-how-to-install/new-ux-2.png":::
 
  6. Once the **Azure AD Connect Provisioning Agent Package** has completed downloading, run the *AADConnectProvisioningAgentSetup.exe* installation file from your downloads folder.
+   >[!NOTE]
+   >When installing for the US Government Cloud use:  
+   >*AADConnectProvisioningAgentSetup.exe ENVIRONMENTNAME=AzureUSGovernment*  
+   >See "[Install an agent in the US government cloud](../articles/active-directory/hybrid/cloud-sync/how-to-install.md#install-an-agent-in-the-us-government-cloud)" for more information.
  7. On the splash screen, select **I agree to the license and conditions**, and then select **Install**.
 
  :::image type="content" source="media/active-directory-cloud-sync-how-to-install/azure-ad-cloud-sync-splash-screen.png" alt-text="Screenshot that shows the Microsoft Azure AD Connect Provisioning Agent Package splash screen." lightbox="media/active-directory-cloud-sync-how-to-install/new-ux-2.png":::