Remove Show-Command link in v6 doc (#4255)

Author: matt9ucci

reference/6/Microsoft.PowerShell.Utility/Trace-Command.md

@@ -325,5 +325,3 @@ You can elect to send the trace data to a user-mode or kernel-mode debugger, to
 [Measure-Command](Measure-Command.md)
 
 [Set-TraceSource](Set-TraceSource.md)
-
-[Show-Command](https://msdn.microsoft.com/en-us/powershell/reference/5.1/Microsoft.PowerShell.Utility/Show-Command)