tunnel example, mention built in (#8383)

Co-authored-by: Shana Matthews <[email protected]>

src/platforms/javascript/common/troubleshooting/index.mdx

@@ -106,7 +106,13 @@ Sentry.init({
 Once configured, all events will be sent to the `/tunnel` endpoint. This solution, however, requires an additional configuration on the server, as the events now need to be parsed and redirected to Sentry. Here's an example for your server component:
 
 ```csharp
-// Requires .NET Core 3.1 and C# 9 or higher
+
+// This functionality is now built-in to the Sentry.AspNetCore package.
+// See https://docs.sentry.io/platforms/dotnet/guides/aspnetcore/#tunnel
+// docs for more information.
+
+// This example shows how you could implement it yourself:
+
 using System;
 using System.Collections.Generic;
 using System.IO;