qdoc: no longer recognizes the version nr in QML refs

All QML references of the form
<QML-module-name><QML-module-version>::<QML-type>::<member-name> have
had the <QML-module-version> removed i.

Task-number: QTBUG-33776
Change-Id: Idde279e0f254cd24ea44f9841662dd81a2c5bbc6
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>