Fix NIB link (#6355)

Author: gewarren

docs/standard/asynchronous-programming-patterns/how-to-use-components-that-support-the-event-based-asynchronous-pattern.md

@@ -57,4 +57,4 @@ Many components provide you with the option of performing their work asynchronou
 ## See Also  
  [How to: Run an Operation in the Background](../../../docs/framework/winforms/controls/how-to-run-an-operation-in-the-background.md)  
  [Event-based Asynchronous Pattern Overview](../../../docs/standard/asynchronous-programming-patterns/event-based-asynchronous-pattern-overview.md)  
- [NOT IN BUILD: Multithreading in Visual Basic](https://msdn.microsoft.com/library/c731a50c-09c1-4468-9646-54c86b75d269)
+ [Multithreading in Visual Basic](../../../docs/visual-basic/programming-guide/concepts/threading/multithreaded-applications.md)