Improve documentation on interaction between models and delegates

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15

Window {
    id: window
    width: 300
    height: 500
    visible: true
    property list<int> a: [1, 2, 3, 4, 5, 6]
    RowLayout {
        anchors.fill: parent
        ListView {
            Layout.fillHeight: true
            model: a
            delegate: Button {
                text: modelData
                onClicked: {
                    a[index] = modelData + 1;
                    console.log("a is now", a)
                }
            }
        }
        ListView {
            id: l
            Layout.fillHeight: true
            model: a
            delegate: Button {
                text: modelData
                onClicked: {
                    model.modelData = modelData + 1;
                    console.log("a is now", l.model, modelData);
                }
            }
        }
    }
}