Fixup broken URL (#17828)

* Fixup broken URL

* update repo name text

Co-authored-by: Scott Addie <10702007+scottaddie@users.noreply.github.com>

Author: pranavkm

aspnetcore/security/authorization/iauthorizationpolicyprovider.md

@@ -178,4 +178,4 @@ To use custom policies from an `IAuthorizationPolicyProvider`, you must:
 services.AddSingleton<IAuthorizationPolicyProvider, MinimumAgePolicyProvider>();
 ```
 
-A complete custom `IAuthorizationPolicyProvider` sample is available in the [aspnet/AuthSamples GitHub repository](https://github.com/dotnet/AspNetCore/tree/release/2.2/src/Security/samples/CustomPolicyProvider).
+A complete custom `IAuthorizationPolicyProvider` sample is available in the [dotnet/aspnetcore GitHub repository](https://github.com/dotnet/aspnetcore/tree/ea555458dc61e04314598c25b3ab8c56362a5123/src/Security/samples/CustomPolicyProvider).