Update index.md

Author: guardrex

aspnetcore/blazor/security/server/index.md

@@ -453,7 +453,7 @@ Two additional classes derived from <xref:Microsoft.AspNetCore.Components.Author
 
 * <xref:Microsoft.AspNetCore.Components.Server.ServerAuthenticationStateProvider> ([reference source](https://github.com/dotnet/aspnetcore/blob/main/src/Components/Endpoints/src/DependencyInjection/ServerAuthenticationStateProvider.cs)): A default  <xref:Microsoft.AspNetCore.Components.Authorization.AuthenticationStateProvider> used by the Blazor framework to manage authentication state on the server when a more specific provider isn't registered.
 
-* <xref:Microsoft.AspNetCore.Components.Server.RevalidatingServerAuthenticationStateProvider> ([reference source](https://github.com/dotnet/aspnetcore/blob/main/src/Components/Server/src/Circuits/RevalidatingServerAuthenticationStateProvider.cs)): A base class for <xref:Microsoft.AspNetCore.Components.Authorization.AuthenticationStateProvider> services that receive an authentication state from the host environment and revalidate it at regular intervals.
+* <xref:Microsoft.AspNetCore.Components.Server.RevalidatingServerAuthenticationStateProvider> ([reference source](https://github.com/dotnet/aspnetcore/blob/main/src/Components/Server/src/Circuits/RevalidatingServerAuthenticationStateProvider.cs)): A base class for <xref:Microsoft.AspNetCore.Components.Authorization.AuthenticationStateProvider> services that receive an authentication state from the host environment and revalidate it at regular intervals. See the [Blazor Web App project template](https://github.com/dotnet/aspnetcore/blob/main/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWeb-CSharp/Components/Account/IdentityRevalidatingAuthenticationStateProvider.cs) for an example implementation. Override <xref:Microsoft.AspNetCore.Components.Server.RevalidatingServerAuthenticationStateProvider.RevalidationInterval> to change the default 30 minute revalidation interval.
 
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