Update documentation of QML

The "First Steps with QML" (https://doc.qt.io/qt-6/qmlfirststeps.html) page seems to be a bit outdated and needs some update. For example:

"For simple UI files such as this one, select File > New File or Project > Application (Qt Quick) > Qt Quick Application - Empty from within Qt Creator."

"New File or Project" has been split up into "New File" and "New Project". In "New Project" there is no "Qt Quick Application - Empty" only "Qt Quick Application".

These are minor problems, but it seems that some of the listed examples are not working out of the box. When I am trying to run the first example from Qt Creator seemingly nothing happens, but the same example is working from the command line.

import QtQuick

Rectangle {
    width: 200
    height: 100
    color: "red"

    Text {
        anchors.centerIn: parent
        text: "Hello, World!"
    }
}

Most likely the problem is that a top level window is missing, see the second example, which has an ApplicationWindow and it works as expected. However, the top level window is also missing from the subsequent examples.