[3.x] VehicleBody docs does not specify unit for engine forces and steering angles

[atirut-w]

Your Godot version:
(Not relevant)(3+?)

Issue description:
Just as the title say. This might not be much of a problem for arcade vehicle physics, but very problematic for racing games with realistic vehicle physics.

URL to the documentation page:
https://docs.godotengine.org/en/latest/classes/class_vehiclebody.html

[Calinou]

but very problematic for racing games with realistic vehicle physics.

While it would be good to document the unit used here (or lack thereof), VehicleBody isn't recommended for realistic physics due its limitations. These limitations will most likely not be lifted, since maintaining a full-fledged vehicle body controller suitable for realistic physics is a lot of work.

[atirut-w]

These limitations will most likely not be lifted, since maintaining a full-fledged vehicle body controller suitable for realistic physics is a lot of work.

For someone like me who know nothing about physics(and the related maths), VehicleBody is my only hope here.

[Vanadiae]

Hi, I just encountered this issue when trying out VehicleBody in godot (specifically the steering angle part). I wanted to fix it, but it seems like it's now fixed in the main branch (so only for Godot 4 as far as I can tell) with commit 5dc3bfb80e84cdb1861f0d5900dc086b04e1e101. The commit does not backport cleanly with git cherry-pick though, but maybe it's fine to only have the fix for Godot 4 (and so the issue could be fixed). It's a big cherry-pick conflict and I don't have any knowledge about Godot's codebase, so I won't try to fix the conflicts myself.