Update aspnetcore/security/samesite.md

Author: danroth27

aspnetcore/security/samesite.md

@@ -325,7 +325,7 @@ Versions of :::no-loc text="Electron"::: include older versions of Chromium. For
 
 | Sample               | Document |
 | ----------------- | ------------ |
-| [Razor Pages](https://github.com/blowdart/AspNetSameSiteSamples/tree/master/AspNetCore31RazorPages)  |  |
+| [Razor Pages](https://github.com/blowdart/AspNetSameSiteSamples/tree/master/AspNetCore31RazorPages)  | <xref:security/samesite/rp31> |
 
 :::moniker-end