qml docs: mising info about the way to access view and/or model from a delegate

\section1 Accessing View and Model from Delegate

You can access the view for which a delegate is used, and its properties, by 
ListView.view in a delegate on a ListView, GridView.view in a delegate 
on a GridView etc. In particular, you can access the model (and its properties) 
by ListView.view.model.

This can be useful, for example, if you want to use the same delegate for a 
number of views, but you want decorations or other features to be different for 
each view and you would like these different settings to be properties of each 
of the views. Similarly it might be of interest to access or show some properties 
of the model (for example, a parameter based on which a query was executed 
etc.).

In the following example delegate shows property "language" of the model, 
and color of one of the fields depends on a property "fruit_color" of the view.

\code
Rectangle {
     width: 200; height: 200

    ListModel {
        id: fruitModel
        property string language: "en"
        ListElement {
            name: "Apple"
            cost: 2.45
        }
        ListElement {
            name: "Orange"
            cost: 3.25
        }
        ListElement {
            name: "Banana"
            cost: 1.95
        }
    }

    Component {
        id: fruitDelegate
        Row {
                Text { text: " Fruit: " + name; color: ListView.view.fruit_color }
                Text { text: " Cost: $" + cost }
                Text { text: " Language: " + ListView.view.model.language }
        }
    }

    ListView {
        property color fruit_color: "green"
        model: fruitModel
        delegate: fruitDelegate
        anchors.fill: parent
    }
}
\endcode

Another important case is when some action (e.g. mouse click) in the 
delegate should update data in the model. In such a case you can, for 
example, define in the model a function 
        setData(int row, const QString & field_name, QVariant new_value),
and call it from the delegate using 
        ListView.view.model.setData(index, field, value), 
provided "field" holds the name of the field which should be updated 
and "value" the new value.