Small changes to compatibility for .NET (#2404)

I did some small changes:
- Made explicit we support .NET 5.0 and older versions. Strictly
speaking .NET Core 2.0 and later includes .NET 5.0 but because the
naming on .NET is very confusing, I think it makes sense to make it
clear
- Ordered the top part, so that iOS and MacOS sections are close, same
for iOS and Android+
- Removed the word "framework". The thing is that there is already .NET
Framework, so the word framework here could be confusing... I could be
convinced it makes sense though 😁
- Modified a little the windows section so it seems slightly more
consistent

source/sdk/dotnet/compatibility.txt

@@ -11,45 +11,45 @@ Platform and Framework Compatibility - .NET SDK
    :depth: 2
    :class: singlecol
 
-Frameworks
+Compatibility
 ----------
-The following table shows which .NET framework
+The following table shows which .NET
 version(s) you can use with Realm on your target platforms:
 
 .. list-table::
    :header-rows: 1
    :widths: 50 50
 
    * - Target Platform
-     - Supported Framework Version(s)
+     - Supported Version(s)
 
    * - | Debian 8 or later
        | RHEL 7.1 or later
        | Ubuntu 16.04 or later
-     - .NET Core 2.0 or later
+     - .NET Core 2.0 or later (.NET 5.0 or later)
 
-   * - Windows
-     - | Windows 8.1 and .NET Core 2.0 or later and 
-         .NET Framework 4.6.1 or later
+   * - Windows 8.1 or later
+     - | .NET Core 2.0 or later (.NET 5.0 or later)
+       | .NET Framework 4.6.1 or later
        | MAUI requires Windows 11 and Windows 10 version 1809 or higher, using 
          Windows UI Library (WinUI) 3.
 
    * - Universal Windows Platform (UWP)
      - .NET Standard 2.0 or later (Fall Creators Update)
 
-   * - Android
-     - | Xamarin.Android for Android 4.1 (API level 16) or later. 
-       | MAUI requires Android 5.0 (API level 21) or later.
-
-   * - macOS (Intel-based Macs)
-     - | .NET Core 2.0 or later
+   * - macOS
+     - | .NET Core 2.0 or later (.NET 5.0 or later)
        | Xamarin.Mac for macOS 10.11 or later. 
        | MAUI requires macOS 10.15 or later, using Mac Catalyst.
 
    * - iOS
      - | Xamarin.iOS for iOS 9 or later. 
        | MAUI requires iOS 11 or later.
 
+   * - Android
+     - | Xamarin.Android for Android 4.1 (API level 16) or later. 
+       | MAUI requires Android 5.0 (API level 21) or later.
+
 Development Environments
 ------------------------