height is used in a 2-dimensional-sense in the docs and it is wrong/confusing

Useage of `height` in docs/examples is unexpected. E.g.: https://cadquery.readthedocs.io/en/latest/examples.html#plate-with-hole

```
# The dimensions of the box. These can be modified rather than changing the
# object's code directly.
length = 80.0
height = 60.0
thickness = 10.0
center_hole_dia = 22.0

# Create a box based on the dimensions above and add a 22mm center hole
result = (
cq.Workplane("XY")
.box(length, height, thickness)
.faces(">Z")
.workplane()
.hole(center_hole_dia)
)
```

The module docs state that `box()` takes `length, width, height` which is conventional and expected. Calling it with `length, height, thickness` is confusing. The underlying issue here is that *height is used in a 2-dimensional-sense*, so I would advocate for using `length, width, height` consistently in all examples and to not bother with `thickness`, and more importantly, to use `width` instead of `height`.

I also noticed this is in the first example I worked through and started to edit the docs but had the need to discuss this first.