DM: proofread DM Coordinate systems after merge
In !385 we added a new section on coordinate systems for the domain model.
This was checked and reviews by approx. 3 people over the weekend, but a final proofread would be good by a fresh set of eyes
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@engelben Change the image from "Heading" to "Yaw" -
@jakob.kaths Add link in "Crossing coordinate system" to the corresponding section in abstract roads