[m-rev.] for review: delete I/O globals from transition guide

[Julien Fischer]

For review by anyone.

The diff is trivial; the request for review is for the idea of removing
these lines.

--------------------

Delete I/O globals from transition guide.

docs/transition_guide.texi:
     As above.

Julien.

diff --git a/doc/transition_guide.texi b/doc/transition_guide.texi
index 642772a..a5ff6a4 100644
--- a/doc/transition_guide.texi
+++ b/doc/transition_guide.texi
@@ -427,12 +427,6 @@ destroying the current state of the world
  and returning a new state of the world.
  This effectively considers the mutable to be part of the state of the world
  @emph{outside} the Mercury program.
-The @code{io} module also provides another way to do this,
-by allowing the storage of information in the @code{io.state}
-using the predicates @code{io.get_globals} and @code{io.set_globals}.
-These predicates take an argument of type @code{univ}, the universal type,
-so that by using @code{type_to_univ} and @code{univ_to_type}
-it is possible to store data of any type in the @code{io.state}.

  Alternatively, you can set things up so that
  the getter and setter predicates of a mutable are @emph{not} I/O operations,