Update VehicleWheel.xml

It seems (please correct me if you understand it otherwise) that the description for the `get_skidinfo()` function is the inverse of what actually happens. I have run some simple tests, and it looks like setting low `Friction Slip` (e.g. try `1` or `2`) causes more skidding and returns smaller values for `get_skidinfo()`, while when the `Friction Slip` is increased, the car skids less and values printed to the console increase (get closer to `1.0`). So it seems that a value of `0.0` means skidding, while a value of `1.0` means no skidding (the description says the exact opposite to this, from what I understood).

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