Adding note for Flex Consumption and .NET 9

Author: mattchenderson

articles/azure-functions/dotnet-isolated-process-guide.md

@@ -860,10 +860,12 @@ Azure Functions currently can be used with the following "Preview" or "Go-live"
 
 | Operating system | .NET preview version |
 | - | - |
-| Linux | .NET 9 Preview 7<sup>1</sup> |
+| Linux | .NET 9 Preview 7<sup>1, 2</sup> |
 
 <sup>1</sup> To successfully target .NET 9, your project needs to reference the [2.x versions of the core packages](#version-2x-preview). If using Visual Studio, .NET 9 requires version 17.12 or later.
 
+<sup>2</sup> .NET 9 is not yet supported on the Flex Consumption SKU.
+
 See [Supported versions][supported-versions] for a list of generally available releases that you can use.
 
 ### Using a preview .NET SDK