[Tagging] building:min_level, building:max_level, min_level, max_level

[Martin Koppenhoefer]

I just noticed once again both tags are around:

A)
building:min_level
building:max_level (is used but AFAIK not documented)

and B)
min_level
max_level

Version A is used and defined here:
https://wiki.openstreetmap.org/wiki/Key:building:levels
https://wiki.openstreetmap.org/wiki/Key:building:min_level
https://wiki.openstreetmap.org/wiki/Simple_3D_buildings

Version B mentions the tags for buildings, but doesn't specify the details:
https://wiki.openstreetmap.org/wiki/Simple_Indoor_Tagging

Do we really need 2 ocmpeting tags for this? If yes, we should add the
prefixed variant to the building page as well. Usage numbers are
low,"mixed" and not clearly in one direction or the other.

Cheers,
Martin
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