(AzureCXP) fixed Isolated process code.

The sample code is referred from here: https://github.com/Azure/azure-functions-dotnet-worker/blob/main/samples/Extensions/EventGrid/EventGridFunction.cs
Updated the same in the document.
resolves MicrosoftDocs/azure-docs#90125

Author: MayankBargali-MSFT

articles/azure-functions/functions-bindings-event-grid-output.md

@@ -119,7 +119,7 @@ public static async Task Run(
 
 The following example shows how the custom type is used in both the trigger and an Event Grid output binding:
 
-:::code language="csharp" source="~/azure-functions-dotnet-worker/samples/Extensions/EventGrid/EventGridFunction.cs" range="12-23":::
+:::code language="csharp" source="~/azure-functions-dotnet-worker/samples/Extensions/EventGrid/EventGridFunction.cs" range="4-49":::
 
 # [C# Script](#tab/csharp-script)