Documentation and behavior mismatch in Workplane.extrude

[The documentation of Workplane.extrude](https://github.com/CadQuery/cadquery/blob/00fdd71d7d6bdab701467bd12920c58ce4d0b784/cadquery/cq.py#L3041) says that `until="next"` extrudes until the next face **orthogonal** to the wire normal, but the actual behavior seems to be different. In my experiment, an inclined face can be used as the target of `"next"`.

In my opinion, this behavior is useful, so the documentation should be fixed.

Test code:
```Python
import cadquery as cq
p = cq.Plane(origin=(0, 0, 10), normal=(0.3, 0, 1))
top_plate = cq.Workplane(p).box(20, 5, 1)
result = (
cq.Workplane()
.rect(10, 4)
.add(top_plate)
.extrude("next")
)
show_object(result)
```

Result: