dotnet: capture feedback code snippet (#13889)

similar to Unity:
* https://github.com/getsentry/sentry-docs/pull/13794/files

Author: bruno-garcia

docs/platforms/dotnet/common/user-feedback/index.mdx

@@ -15,20 +15,13 @@ User Feedback for **[ASP.NET](/platforms/dotnet/guides/aspnet/user-feedback/#int
 
 </Alert>
 
-You can create a form to collect the user input in your preferred framework, and use the SDK's API to send the information to Sentry. You can also use the widget, as described below. If you'd prefer an alternative to the widget or do not have a JavaScript frontend, you can use this API:
+You can create a form to collect the user input in your preferred framework, and use the SDK's API to send the information to Sentry. You can also use the widget, as described below. If you'd prefer an alternative to the widget or do not have a web frontend, you can use this API:
 
 ```csharp {tabTitle:C#}
 var eventId = SentrySdk.CaptureMessage("An event that will receive user feedback.");
 
-SentrySdk.CaptureUserFeedback(eventId, "[email protected]", "It broke.", "The User");
-```
-
-```fsharp {tabTitle:F#}
-open Sentry
-
-let eventId = SentrySdk.CaptureMessage("An event that will receive user feedback.")
-
-SentrySdk.CaptureUserFeedback(eventId, "[email protected]", "It broke.", "The User")
+// The associated event is optional
+SentrySdk.CaptureFeedback("It broke.", "[email protected]", "The User", associatedEventId: eventId);
 ```
 
 ## Crash-Report Modal