[m-rev.] for post-commit review: fix io section of transition guide

[Julien Fischer]

Hi Zoltan,

On Wed, 11 Feb 2015, Zoltan Somogyi wrote:

> For post-commit review by anyone.
>
> I will look at the other sections later.

You seem to have committed another change along with this one
which adds MR_hash_string5, MR_hash_string6 etc.   This has
broken building of the stage2 library.

Cheers,
Julien.