Fix obsolete version number in docs.
Fix obsolete version number in docs.

Use %VERSION% so that we don't have to fix this for every release.

Task-number: 251418
Reviewed-by: Trust Me
(cherry picked from commit cfa04d53ff58d45d7811637c8be76099740d25c5)

radekp/qt,igor-sfdc/qt-wk,RLovelett/qt,RLovelett/qt,KDE/qt,KDE/qt,RLovelett/qt,radekp/qt,KDE/qt,radekp/qt,KDE/qt,KDE/qt,RLovelett/qt,igor-sfdc/qt-wk,RLovelett/qt,KDE/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,RLovelett/qt,RLovelett/qt,KDE/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,radekp/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,RLovelett/qt,radekp/qt,radekp/qt,radekp/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,radekp/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,KDE/qt,igor-sfdc/qt-wk