[Tagging] Clarify tag access doc

[Masi Master]

Hi,
for me visitors belongs to customer, and employee belongs to private.

I think between designated and official there are different opinions. For  
now I would say there is no big difference. Both used primary for foot-,  
cycle- or bridleways.

A way with a sign: "Private way, use with own risk" I would tag with  
access=permissive. And maybe i.e. a only footway-bridge (foot=designated),  
which connecting 2 big cycleways/-routes, I sometimes add  
bicycle=permissive. (Second example is my personal view. Maybe  
bicycle=unmount is also possible.)

Cheers,
Masi