Repair broken links (#36721)

* Fix broken links.

* Update webapi.md with sample code link

Linking to migration directory which contains >= .NET 6 samples for web api.

---------

Co-authored-by: Wade Pickett <wpickett@microsoft.com>

Author: TimShererWithAquent

aspnetcore/migration/fx-to-core/areas/webapi.md

@@ -176,7 +176,7 @@ The migrated `ProductsController` contains the following highlighted attributes:
 
 Run the migrated project, and browse to `/api/products`.  For example: https://localhost:`<port>`/api/products. A full list of three products appears. Browse to `/api/products/1`. The first product appears.
 
-[View or download sample code](https://github.com/dotnet/AspNetCore.Docs/tree/main/aspnetcore/migration/webapi/sample/) ([how to download](xref:fundamentals/index#how-to-download-a-sample))
+[View or download sample code](https://github.com/dotnet/AspNetCore.Docs/tree/main/aspnetcore/migration/) ([how to download](xref:fundamentals/index#how-to-download-a-sample))
 
 ## Additional resources
 
@@ -189,8 +189,6 @@ Run the migrated project, and browse to `/api/products`.  For example: https://l
 :::moniker range="< aspnetcore-6.0"
 This article demonstrates the steps required to migrate from ASP.NET 4.x Web API to ASP.NET Core MVC.
 
-[View or download sample code](https://github.com/dotnet/AspNetCore.Docs/tree/main/aspnetcore/migration/webapi/sample) ([how to download](xref:fundamentals/index#how-to-download-a-sample))
-
 ## Prerequisites
 
 [!INCLUDE [prerequisites](../../../includes/net-core-prereqs-vs-3.1.md)]