That is all the documentation there is. It’s only me working on this project and it is very hard to write a comprehensive documentation for a project this large.
Have you checked the class documentation which would contain the settings you are looking for? Most settings are explained in the class documentation even though they might have a slightly different name than displayed in the inspector.
Rigidbodies work with AIPath, but there is only rudimentary support using AddForce. Games which use rigidbodies usually need them to function very differently so it’s hard to write a one implementation works everywhere. In contrast to Character Controller which everybody use in pretty much the same way.
Due to rigidbodies being used in so varying ways (see previous answer) it is not a high priority users are better of implementing that themselves in a way which suits their game.
The search in the docs will only find class names or variables, not much else. Look at the related pages tab and in the class documentation for whatever class you want to find out more about.