Ureal Engine: Update user feedback examples (#14683)

This PR updates code examples (both C++ and blueprint) showing how to
use the new user feedback API.

Related to:
- getsentry/sentry-unreal#1051

Author: tustanivsky

platform-includes/user-feedback/sdk-api-example/unreal.mdx

@@ -1,19 +1,19 @@
 ```cpp
 USentrySubsystem* SentrySubsystem = GEngine->GetEngineSubsystem<USentrySubsystem>();
 
-USentryId* EventId = SentrySubsystem->CaptureMessage(TEXT("Message with feedback"));
+FString EventId = SentrySubsystem->CaptureMessage("Message with feedback");
 
-USentryUserFeedback* UserFeedback = NewObject<USentryUserFeedback>();
-User->Initialize(EventId);
-User->SetEmail("[email protected]");
-User->SetName("Name");
-User->SetComment("Some comment");
+USentryFeedback* UserFeedback = NewObject<USentryFeedback>();
+UserFeedback->Initialize("Feedback message");
+UserFeedback->SetName("Jon Doe");
+UserFeedback->SetContactEmail("[email protected]");
+UserFeedback->SetAssociatedEvent(EventId);
 
-SentrySubsystem->CaptureUserFeedback(UserFeedback);
+SentrySubsystem->CaptureFeedback(UserFeedback);
 
 // OR
 
-SentrySubsystem->CaptureUserFeedbackWithParams(EventId, "[email protected]", "Some comment", "Name");
+SentrySubsystem->CaptureFeedbackWithParams("Feedback message", "Jon Doe", "[email protected]", EventId);
 ```
 
 The same result can be achieved by calling corresponding functions in blueprint: