[Tagging] piste:grooming documentation

[yves]

I found the piste:grooming description from the 'Piste maps' or the 
Key:piste:grooming pages that was derived from the earlier not very 
clear. I've made an attempt to re-write it to document actual usage here:

https://wiki.openstreetmap.org/wiki/Talk:Key:piste:grooming#Page_rewrite_proposal

I'd like to have some comments if you think I missed something. This is 
about *actual usage* and better comprehension. If the values re-used 
from one type of piste to another does not suits you, it's another story 
that can be dealt with later.

Yves

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