Documentation fix for QVersitWriter.
Documentation fix for QVersitWriter.

Added clause about client needing to ensure that the QIODevice is opened
and closed correctly.

Task-number: QTMOBILITY-1376
Change-Id: I22ebc4aea37af332c8075489e55e513dd20a2edb
Reviewed-By: Keith Isdale

enthought/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,KDE/android-qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,KDE/android-qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility