Config setting descriptions are unlcear

[Pharap]

The first setting arduino.path is pretty clear.
The other three settings however, are not well documented by their corresponding comments.

The second setting, arduino.additionalUrls, is unclear.

Additional URLs for 3rd party packages. You can have multiple URLs in one string with comma(,) as separator, or have a string array. The default value is empty.

It doesn't specify what 'packages'.
(I have inferred from the name of a past issue that it means 'board packages', but I can see that others might not make the connection.)

And the final two settings have no comment at all.
It is unclear what values arduino.logLevel supports other than info.
Admittedly clicking the edit icon reveals verbose to be the other option, but it would still be nice to have the comment filled in properly.
While one would hope that arduino.enableUSBDetection is obvious (detecting serial devices connected via USB), it should still be documented for the sake of clarity.

[czgtest]

improve some descriptions on v0.2.18