Add clarifications:

- Linux requirement for local test runner
- Syntax highlighting "etc."
- Requirements for keeping a debug server running

Author: codingthat

docs/INSTALLATION.md

@@ -3,6 +3,7 @@
 ## Installing Godot Engine
 
 The GDScript track is built on top of [Godot Engine][godot-engine], which runs on Windows, Linux, macOS, and Android.
+For the moment, the test runner for [working locally][working-locally] requires Linux.
 This track requires Godot version 4.0 or greater.
 
 After completing the installation, you can verify if the CLI was installed successfully by running this command in a terminal:
@@ -46,8 +47,10 @@ With the installation steps done, you should be able start from any exercise dir
 
 ## Using an IDE
 
-For syntax checking of GDScript files from, for example, [Visual Studio Code][vscode], you'll need to keep the Godot GUI running with a project open in order to activate the debug server, and an extension like [godot-tools][godot-tools] installed and activated.
+For features like syntax highlighting of GDScript files from, for example, [Visual Studio Code][vscode], you'll need an extension like [godot-tools][godot-tools] installed and activated, and a running debug server.
+When you open the Godot GUI and open a project, a debug server automatically runs in the background until you close the project or Godot.
 
 [godot-engine]: https://godotengine.org/
+[working-locally]: /docs/using/solving-exercises/working-locally.md
 [vscode]: https://code.visualstudio.com/download
 [godot-tools]: https://open-vsx.org/vscode/item?itemName=geequlim.godot-tools