patch applied (packages/base): docs: mention that Foreign.unsafePerformIO is deprecated

[Simon Marlow]

Tue Jul 20 01:28:04 PDT 2010  Simon Marlow <marlowsd at gmail.com>
  * docs: mention that Foreign.unsafePerformIO is deprecated
  We can't actually deprecate it without introducing a name clash
  between Foreign.unsafePerformIO and System.IO.Unsafe.unsafePerformIO

    M ./Foreign.hs -2 +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/base;a=darcs_commitdiff;h=20100720082804-12142-92fbb9c274bc52abaadceaed20da760fd7572c7b.gz