[Tagging] addr:floor and level:ref - Wiki review welcomed

[Mateusz Konieczny]

I heavily edited https://wiki.openstreetmap.org/wiki/Key:addr:floor
and created https://wiki.openstreetmap.org/wiki/Key:level:ref

Please, edit this pages if something can be improved.

Review of this pages also would be welcomed.

(edits triggered by https://github.com/streetcomplete/StreetComplete/issues/1487
and done as part of survey of a tagging situation before a potential implementation)
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