chore(civil3d): add comment for featureline display values #509
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Just adds a simple POC comment to featureline display value conversion.
Featurelines are 2.5d curves: they can have line or arc segments, and different elevations at each vertex.
There is no native way to retrieve the full 3d accurate representation of a featureline, so currently we are sending them as 3d polylines with line segments only.
Adding comment for context in case future bug reports happen due to polyline representation of polycurve featurelines.