Update 22-to-30.md (#18119)

Author: Rick-Anderson

aspnetcore/migration/22-to-30.md

@@ -325,7 +325,7 @@ Projects default to the [in-process hosting model](xref:host-and-deploy/aspnet-c
 
 ### Configuration
 
-Migrate Kestrel configuration to the web host builder provided by `ConfigureWebHostDefaults` (*Program.cs*):
+Migrate Kestrel configuration to the [web host builder](#hostb) provided by `ConfigureWebHostDefaults` (*Program.cs*):
 
 ```csharp
 public static IHostBuilder CreateHostBuilder(string[] args) =>
@@ -1016,6 +1016,8 @@ public void Configure(IApplicationBuilder app)
 }
 ```
 
+<a name="hostb"></a>
+
 ## HostBuilder replaces WebHostBuilder
 
 The ASP.NET Core 3.0 templates use [Generic Host](xref:fundamentals/host/generic-host). Previous versions used [Web Host](xref:fundamentals/host/web-host). The following code shows the ASP.NET Core 3.0 template generated `Program` class: