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Update index.md (#23526) 

* Update index.md

* Update aspnetcore/fundamentals/configuration/index.md
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aspnetcore/fundamentals/configuration/index.md
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@ -40,7 +40,7 @@ ASP.NET Core web apps created with [dotnet new](/dotnet/core/tools/dotnet-new) o
var builder = WebApplication.CreateBuilder(args);
```
`CreateBuilder` provides default configuration for the app in the following order:
[WebApplication.CreateBuilder](xref:Microsoft.AspNetCore.Builder.WebApplication.CreateBuilder%2A) initializes a new instance of the <xref:Microsoft.AspNetCore.Builder.WebApplicationBuilder> class with preconfigured defaults. The initialized `WebApplicationBuilder` (`builder`) provides default configuration for the app in the following order:
1. [ChainedConfigurationProvider](xref:Microsoft.Extensions.Configuration.ChainedConfigurationSource) : Adds an existing `IConfiguration` as a source. In the default configuration case, adds the [host](#hvac) configuration and setting it as the first source for the _app_ configuration.
1. [appsettings.json](#appsettingsjson) using the [JSON configuration provider](#file-configuration-provider).