[Tagging] nhd tags - documentation page review

[Mateusz Konieczny]

I created 
https://wiki.openstreetmap.org/wiki/Key:nhd:fcode
https://wiki.openstreetmap.org/wiki/Key:nhd:ftype
https://wiki.openstreetmap.org/wiki/Key:nhd:reach_code
https://wiki.openstreetmap.org/wiki/Key:nhd:com_id 
about tags added in imports. 

Review is welcomed, especially the first two where I described tags 
with over 250 000 uses as pointless and unwanted.
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