Update aspnetcore/fundamentals/servers/kestrel/endpoints.md

Co-authored-by: Rick Anderson <[email protected]>

Author: JamesNK

aspnetcore/fundamentals/servers/kestrel/endpoints.md

@@ -275,7 +275,7 @@ webBuilder.ConfigureKestrel(serverOptions =>
 SNI can be configured in two ways:
 
 * Create an endpoint in code and select a certificate using the host name with the <xref:Microsoft.AspNetCore.Server.Kestrel.Https.HttpsConnectionAdapterOptions.ServerCertificateSelector%2A> callback.
-* Configure a mapping between host names and HTTPS options in configuration. For example, JSON in `appsettings.json`.
+* Configure a mapping between host names and HTTPS options in [Configuration](xref:fundamentals/configuration/index). For example, JSON in  the `appsettings.json` file.
 
 ### SNI with `ServerCertificateSelector`