docs: Add DefaultProblemDetailsWriter supported media types; fix typo (#36836)

* Initial plan

* Add supported media types info for DefaultProblemDetailsWriter; fix typo

Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>

* Update media types supported by DefaultProblemDetailsWriter

Clarified supported media types for DefaultProblemDetailsWriter.  Formatted it so it would be easier to read.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>
Co-authored-by: Wade Pickett <wpickett@microsoft.com>

Author: Copilot

aspnetcore/fundamentals/error-handling-api.md

@@ -5,7 +5,7 @@ description: Learn about error handling in ASP.NET Core APIs with Minimal APIs a
 ai-usage: ai-assisted
 ms.author: wpickett
 monikerRange: '>= aspnetcore-7.0'
-ms.date: 08/15/2025
+ms.date: 03/04/2026
 uid: fundamentals/error-handling-api
 ---
 
@@ -139,9 +139,18 @@ In the following code, `httpContext.Response.WriteAsync("Fallback: An error occu
 
 The preceding code:
 
-* Writes an error message with the fallback code if the `problemDetailsService` is unable to write a `ProblemDetails`. For example, an endpoint where the [Accept request header](https://developer.mozilla.org/docs/Web/HTTP/Headers/Accept) specifies a media type that the `DefaulProblemDetailsWriter` does not support.
+* Writes an error message with the fallback code if the `problemDetailsService` is unable to write a `ProblemDetails`. For example, an endpoint where the [Accept request header](https://developer.mozilla.org/docs/Web/HTTP/Headers/Accept) specifies a media type that the `DefaultProblemDetailsWriter` does not support.
 * Uses the [Exception Handler Middleware](#exception-handler).
 
+> [!NOTE]
+> The `DefaultProblemDetailsWriter` supports the following media types in the `Accept` request header:
+>
+> * `application/json`
+> * `application/problem+json`
+> * Wildcard types such as `*/*` and `application/*`
+>
+> Non-JSON media types, such as `application/xml` or `text/html`, are **not** supported and trigger the fallback behavior.
+
 The following sample is similar to the preceding except that it calls the [`Status Code Pages middleware`](#client-and-server-error-responses).
 
 :::code language="csharp" source="~/fundamentals/minimal-apis/handle-errors/sample8/Program.cs" id="snippet_IProblemDetailsServiceWithStatusCodePageFallback" highlight="15":::
@@ -255,4 +264,4 @@ The contents of the response can be modified from outside of the controller usin
 
 * [How to Use ModelState Validation in ASP.NET Core Web API](https://code-maze.com/aspnetcore-modelstate-validation-web-api/)
 * [View or download sample code](https://github.com/dotnet/AspNetCore.Docs.Samples/tree/main/fundamentals/middleware/problem-details-service)
-* [Hellang.Middleware.ProblemDetails](https://www.nuget.org/packages/Hellang.Middleware.ProblemDetails/)
+* [Hellang.Middleware.ProblemDetails](https://www.nuget.org/packages/Hellang.Middleware.ProblemDetails/)