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Update index.md (#24311)

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aspnetcore/fundamentals/middleware/index.md
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@ -225,16 +225,16 @@ app.Map("/level1", level1App => {
The following table shows the requests and responses from `http://localhost:1234` using the previous code:
| Request | Response |
| ----------------------------- | ---------------------------- |
| localhost:1234 | Hello from non-Map delegate. |
| localhost:1234/?branch=main | Branch used = main |
| Request | Response |
| ----------------------------- | ------------------------------ |
| `localhost:1234` | `Hello from non-Map delegate.` |
| `localhost:1234/?branch=main` | `Branch used = main` |
<xref:Microsoft.AspNetCore.Builder.UseWhenExtensions.UseWhen%2A> also branches the request pipeline based on the result of the given predicate. Unlike with `MapWhen`, this branch is rejoined to the main pipeline if it doesn't short-circuit or contain a terminal middleware:
[!code-csharp[](index/snapshot/Chain60/ProgramUseWhen.cs?highlight=4-5)]
In the preceding example, a response of "Hello from main pipeline." is written for all requests. If the request includes a query string variable `branch`, its value is logged before the main pipeline is rejoined.
In the preceding example, a response of `Hello from non-Map delegate.` is written for all requests. If the request includes a query string variable `branch`, its value is logged before the main pipeline is rejoined.
## Built-in middleware