Replace Windows XP token (dotnet#148)

For dotnet/docs#4801

Author: ErlendLandro

includes/tla2sharptla-whistler-md.md

@@ -3143,7 +3143,7 @@
       <Docs>
         <summary>Gets a value that indicates whether the current operating system is Microsoft Windows XP [!INCLUDE[TLA#tla_tpc](~/includes/tlasharptla-tpc-md.md)] Edition.</summary>
         <value>
-          <see langword="true" /> if the current operating system is [!INCLUDE[TLA2#tla_whistler](~/includes/tla2sharptla-whistler-md.md)] [!INCLUDE[TLA2#tla_tpc](~/includes/tla2sharptla-tpc-md.md)] Edition; otherwise, <see langword="false" />.</value>
+          <see langword="true" /> if the current operating system is Windows XP [!INCLUDE[TLA2#tla_tpc](~/includes/tla2sharptla-tpc-md.md)] Edition; otherwise, <see langword="false" />.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[