std.mmfile doc.

[BLS]

Hi,
seems that the std.mmfile documentation is not up to date.
Unfortunately I haven't D2 on this machine. But afaik UnMap was part of 
std.mmfile.  I wrote this 'cause Robert plans to write a memory mapped 
database, and I've recommended him to use Phobos2 instead of Tango.
Bjoern