[Tagging] Clarify tag access doc

[Pieren]

On Tue, Sep 11, 2012 at 3:42 PM, Martin Koppenhöfer
<dieterdreist at gmail.com> wrote:

> IIRR those were initially intended to mean the same.

but do you agree with the current definition ?

> Strange tagging. Access=designated does not follow the convention <mode of transport>=designated. You cannot infer access restrictions for cars from this (I.e. fall back to the default, which depends on the highway class).

But the wiki says "The values can be used with the access tag or with
tags associated with particular forms of transport.". If you say that
some values are not going to be used with the general "access" key,
then we have to document it (currently, taginfo reports 21000
access=designated).

Pieren