Update documentation to remove references to .NET 10 preview

docs/csharp/fundamentals/tutorials/file-based-programs.md

@@ -9,10 +9,6 @@ ai-usage: ai-assisted
 
 # Tutorial: Build file-based C# programs
 
-> [!IMPORTANT]
-> File-based apps are a feature of .NET 10, which is in preview.
-> Some information relates to prerelease product that might be modified before release. Microsoft makes no warranties, express or implied, with respect to the information provided here.
-
 *File-based apps* are programs contained within a single `*.cs` file that are built and run without a corresponding project (`*.csproj`) file. File-based apps are ideal for learning C# because they have less complexity: The entire program is stored in a single file. File-based apps are also useful for building command line utilities. On Unix platforms, file-based apps can be run using `#!` (shebang) directives.
 
 In this tutorial, you:
@@ -32,7 +28,7 @@ You build a file-based program that writes text as ASCII art. The app is contain
 
 ## Prerequisites
 
-- The .NET 10 preview SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
+- The .NET 10 SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
 - Visual Studio Code. Download it from the [Visual Studio Code homepage](https://code.visualstudio.com/Download).
 - (Optional) The C# DevKit extension for Visual Studio Code. Download it from the [Visual Studio Code marketplace](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csdevkit).
 

docs/csharp/whats-new/csharp-14.md

@@ -22,7 +22,7 @@ C# 14 is supported on **.NET 10**. For more information, see [C# language versio
 
 You can download the latest .NET 10 SDK from the [.NET downloads page](https://dotnet.microsoft.com/download). You can also download [Visual Studio 2022](https://visualstudio.microsoft.com/vs/), which includes the .NET 10 SDK.
 
-New features are added to the "What's new in C#" page when they're available in public preview releases. The [working set](https://github.com/dotnet/roslyn/blob/main/docs/Language%20Feature%20Status.md#working-set) section of the [roslyn feature status page](https://github.com/dotnet/roslyn/blob/main/docs/Language%20Feature%20Status.md) tracks when upcoming features are merged into the main branch. This article was last updated for .NET 10 Preview 1.
+New features are added to the "What's new in C#" page when they're available in public preview releases. The [working set](https://github.com/dotnet/roslyn/blob/main/docs/Language%20Feature%20Status.md#working-set) section of the [roslyn feature status page](https://github.com/dotnet/roslyn/blob/main/docs/Language%20Feature%20Status.md) tracks when upcoming features are merged into the main branch.
 
 You can find any breaking changes introduced in C# 14 in our article on [breaking changes](~/_roslyn/docs/compilers/CSharp/Compiler%20Breaking%20Changes%20-%20DotNet%2010.md).
 

docs/csharp/whats-new/tutorials/compound-assignment-operators.md

@@ -39,7 +39,7 @@ In this tutorial, you:
 
 ## Prerequisites
 
-- The .NET 10 preview SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
+- The .NET 10 SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
 - Visual Studio 2026 (preview). Download it from the [Visual Studio insiders page](https://visualstudio.microsoft.com/insiders/).
 
 ## Analyze the starting sample

docs/csharp/whats-new/tutorials/extension-members.md

@@ -26,7 +26,7 @@ In this tutorial, you:
 
 ## Prerequisites
 
-- The .NET 10 preview SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
+- The .NET 10 SDK. Download it from the [.NET download site](https://dotnet.microsoft.com/download/dotnet/10.0).
 - Visual Studio 2026 (preview). Download it from the [Visual Studio insiders page](https://visualstudio.microsoft.com/insiders/).
 
 ## Create the sample application