Doc should use units.gu for size, not pixel

E.G http://developer.ubuntu.com/api/qml/sdk-14.04/QtQuick.Column/

Column {
    spacing: 2
    Rectangle { color: "red"; width: 50; height: 50 }
    Rectangle { color: "green"; width: 20; height: 50 }
    Rectangle { color: "blue"; width: 50; height: 20 }
}

should be

Column {
    spacing: units.gu(1)
    Rectangle { color: "red"; width: units.gu(5); height: units.gu(5) }
    Rectangle { color: "green"; width: units.gu(2); height: units.gu(5); }
    Rectangle { color: "blue"; width: units.gu(5); units.gu(2); }
}