DoIterator adaptor documentation missing

[nobody]

The documentation for the iterator adaptor library
nowhere specifies the complete requirements for the
policies class.  All it does is give a rough verbal
description and an example of one particular policies
class.  There needs to be full documentation of the
Policies concept for this library, similar to the
documentation for the STL concepts, e.g., list of
expressions that must be valid (and for what types) and
their effects.  In particular, I cannot tell how
general the advance() function must be.  Does it need
to be a template that accepts arbitrary unsigned
integer types?  Or can it just accept values of the
Distance type?  Similar questions arise for equal and
less.

[david_abrahams]

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The library no longer uses a policies class.