Update openapi-aot.md (#34341)

* Update openapi-aot.md

Fixes #34340

* Update openapi-aot.md

* Update openapi-aot.md

* Update aspnetcore/release-notes/aspnetcore-9/includes/openapi-aot.md

* Update aspnetcore/release-notes/aspnetcore-9/includes/openapi-aot.md

* Update aspnetcore/release-notes/aspnetcore-9/includes/openapi-aot.md

* Update aspnetcore/release-notes/aspnetcore-9/includes/openapi-aot.md

Co-authored-by: Tom Dykstra <[email protected]>

---------

Co-authored-by: Tom Dykstra <[email protected]>

Author: Rick-Anderson

aspnetcore/release-notes/aspnetcore-9/includes/openapi-aot.md

@@ -1,8 +1,6 @@
 ### Microsoft.AspNetCore.OpenApi supports trimming and Native AOT
 
-The new built-in OpenAPI support in ASP.NET Core now also supports trimming and Native AOT.
-
-### Get started
+OpenAPI in ASP.NET Core supports trimming and native AOT. The following steps create and publish an OpenAPI app with trimming and native AOT:
 
 Create a new ASP.NET Core Web API (Native AOT) project.
 
@@ -16,13 +14,7 @@ Add the Microsoft.AspNetCore.OpenAPI package.
 dotnet add package Microsoft.AspNetCore.OpenApi --prerelease
 ```
 
-For this preview, you also need to add the latest Microsoft.OpenAPI package to avoid trimming warnings.
-
-```console
-dotnet add package Microsoft.OpenApi
-```
-
-Update *Program.cs* to enable generating OpenAPI documents.
+Update `Program.cs` to enable generating OpenAPI documents.
 
 ```diff
 + builder.Services.AddOpenApi();
@@ -37,5 +29,3 @@ Publish the app.
 ```console
 dotnet publish
 ```
-
-The app publishes using Native AOT without warnings.