[Tagging] Request to document (or retag) surface=hard/interlock/laterite

[Mateusz Konieczny]

surface=hard/interlock/laterite are used by some people but how these
tags should be interpreted is not clear.

To all people using these tags: consider using other more popular ones
(surface=hard seems to be equivalent of surface=paved) or document them
on wiki (I have no idea whatever road with surface=laterite should be
treated as unpaved or as paved one).

surface=interlock seems to be better tagged as surface=paving_stones +
paving_stones=interlock, but it is not clear what was intended by
people using this tag.