[Tagging] change recommendation from "depth" to "length" for the adit length?

[muzirian]

Using Depth isnt wrong but I think length is usable to, since adits are
usually part of features which have depth.so using length will be less
confusing?

Cheers
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20170512/2068781d/attachment.html>