In the help pages: A fromVector() example is not right

Dear Qt developers:

In https://doc.qt.io/qt-5/qlist.html it's written:

{{ QList<double> list = QVector<T>::fromVector(vect);}}
{{ // list: [20.0, 30.0, 40.0, 50.0]}}

But if, for example, T is `double`, you get:

{{ error: no member named 'fromVector' in 'QVector<double>'}}

which makes sense (because `QVector` doesn't have `fromVector()`, unlike `QList`).

Thanks for making Qt better.