Update .NET version mentions in docs

Author: GlebChili

docfx_project/articles/overview/core_concepts/core_concepts.md

@@ -5,7 +5,7 @@ title: "Core Concepts"
 
 # Core Concepts
 
-Gmod.NET modules are essentially .NET (currently version 6.0) class libraries which reference [GmodNET.API nuget package](https://www.nuget.org/packages/GmodNET.API/) as their dependency.
+Gmod.NET modules are essentially .NET (currently version 7.0) class libraries which reference [GmodNET.API nuget package](https://www.nuget.org/packages/GmodNET.API/) as their dependency.
 Each module should contain one or more implementation of [GmodNET.API.IModule](xref:GmodNET.API.IModule) interface.
 Gmod.NET runtime will instantiate each class derived from `IModule` by calling its parameterless constructor.
 

docfx_project/articles/tutorials/hello-world-detailed/index.md

@@ -4,7 +4,7 @@ title: "A comprehensive introduction to Visual Studio, C# and the 'Hello World'
 ---
 
 > [!WARNING]
-> This article was written for an earlier version of Gmod.NET. In order to use the latest version of Gmod.NET you need to have **.NET 6** instead of **.NET 5** and **Visual Studio 2022** instead of **Visual Studio 2019**.
+> This article was written for an earlier version of Gmod.NET. In order to use the latest version of Gmod.NET you need to have **.NET 7** instead of **.NET 5** and **Visual Studio 2022** instead of **Visual Studio 2019**.
 
 # A comprehensive introduction to Visual Studio, C# and the Hello World code
 At the end of this tutorial you will have created and installed your own module that simply states: 'Hello World!' in the console. We will write a bit of C# (pronounce C-Sharp) code and learn about the basics of C# with regards to Gmod.NET module making.

docfx_project/articles/tutorials/hello-world/index.md

@@ -3,6 +3,9 @@ uid: tutorial_hello_world
 title: "A quick start with 'Hello World'"
 ---
 
+> [!WARNING]
+> This article was written for an earlier version of Gmod.NET. In order to use the latest version of Gmod.NET you need to have **.NET 7** instead of **.NET 6**.
+
 # A quick start with 'Hello World'
 At the end of this tutorial you will have created and installed your own module that simply states: 'Hello World!' in the console. We will write our module using a bit of C# (pronounce C-Sharp) code.
 
@@ -16,7 +19,7 @@ At the end of this tutorial you will have created and installed your own module
       * .NET SDK
       * NuGet Package manager
       * C# and Visual Basic
-      * .NET 6.0 Runtime
+      * .NET 7.0 Runtime
 * Windows 10 or newer.
 * An internet connection
 * A copy of [Garry's Mod installed through Steam](https://store.steampowered.com/app/4000/garrys_mod)