Doc: qdoc does not understand special characters

You have to use \unicode commands, but those won't produce the correct
results within a \code command, so I cannot use them here.

Change-Id: I34ab32dd649bdf4167cfcd295ef1f9546a670ea5
Reviewed-on: http://codereview.qt-project.org/5873


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>