It should be noted that the documentation built-into the engine is mostly documentation for the different classes, and that tutorials, guides and explanations written in prose still need to be viewed from a browser.

You can also Ctrl+click most things in the code editor to open its documentation.

Its improved a lot since the early days but the docs can always be refined further.

If you find something that needs improvement opening an issue over here will get a few eyes on it.

https://github.com/godotengine/godot-docs/labels/topic%3Adotnet