Update README.md

Author: MatthewMcGlynn

ComputeAdmin/README.md

@@ -81,7 +81,7 @@ To verify that the command ran successfully, go to Marketplace in the portal, an
 Run the below command to remove an uploaded VM image. After removal, tenants will no longer be able to deploy virtual machines with this image.
 
 ```powershell
-Remove-VMImage -publisher "Canonical" -offer "UbuntuServer" -sku "14.04.3-LTS" -version "1.0.0" -osType Linux -tenantID <GUID AADTenant>
+Remove-VMImage -publisher "Canonical" -offer "UbuntuServer" -sku "14.04.3-LTS" -version "1.0.0" -tenantID <GUID AADTenant>
 ```
 
 Note: This cmdlet will remove the associated Marketplace item unless the -KeepMarketplaceItem parameter is specified.