Update Form.ProcessCmdKey remarks (#3328)

Referenced support articles no longer exist. Suggested to replace with a link to WinForms keyboard input documentation.

Author: MSDN-WhiteKnight

xml/System.Windows.Forms/Form.xml

@@ -5138,11 +5138,9 @@ This example assumes that the `CreateMyOpaqueForm` method is called from another
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- The <xref:System.Windows.Forms.Form.ProcessCmdKey%2A> method overrides the base  
+ The <xref:System.Windows.Forms.Form.ProcessCmdKey%2A> method overrides the base <xref:System.Windows.Forms.ContainerControl.ProcessCmdKey%2A?displayProperty=nameWithType> implementation to provide additional handling of main menu command keys and MDI accelerators.  
   
- <xref:System.Windows.Forms.ContainerControl.ProcessCmdKey%2A?displayProperty=nameWithType> implementation to provide additional handling of main menu command keys and MDI accelerators.  
-  
- For information about trapping keystrokes, see [How to trap keystrokes in controls by using Visual C#](https://support.microsoft.com/help/320584/how-to-trap-keystrokes-in-controls-by-using-visual-c) and [How to trap keystrokes in .NET controls by using Visual Basic .NET](https://support.microsoft.com/help/320583/how-to-trap-keystrokes-in-net-controls-by-using-visual-basic-net-or-vi) in the Microsoft Support website.  
+ For information about keyboard input, see [Keyboard Input in a Windows Forms Application](/dotnet/framework/winforms/keyboard-input-in-a-windows-forms-application).  
   
  ]]></format>
         </remarks>