Do not show unnecessary steps for creating AOT-compatible OpenAPI application when running in .NET 10 (#34757)

* Only show steps for adding packages to the "webapiaot" template if running .NET 9 or lower

I also removed the --prerelease flag from the package, no reason to add a prerelease version; AOT works fine without prerelease

* Change the ways monikers are layed out

Author: sander1095

aspnetcore/fundamentals/openapi/aspnetcore-openapi.md

@@ -259,10 +259,14 @@ Create a new ASP.NET Core Web API (Native AOT) project.
 dotnet new webapiaot
 ```
 
+:::moniker-end
+
+:::moniker range="= aspnetcore-9.0"
+
 Add the Microsoft.AspNetCore.OpenAPI package.
 
 ```console
-dotnet add package Microsoft.AspNetCore.OpenApi --prerelease
+dotnet add package Microsoft.AspNetCore.OpenApi
 ```
 
 Update `Program.cs` to enable generating OpenAPI documents.
@@ -275,12 +279,12 @@ var app = builder.Build();
 + app.MapOpenApi();
 ```
 
+:::moniker-end
+
 Publish the app.
 
 ```console
 dotnet publish
 ```
 
-:::moniker-end
-
 [!INCLUDE[](~/fundamentals/openapi/includes/aspnetcore-openapi6-8.md)]