Improve the `ListView` documentation by explaining the `ListItem`

[TomJGooding]

I think the ListView documentation could be improved by explaining the ListItem.

Here's a simple example adapted from the docs. I don't think it is clear from the documentation how you might get the Label text when a ListItem is highlighted:

from textual import on
from textual.app import App, ComposeResult
from textual.widgets import Label, ListItem, ListView


class ListViewExample(App):
    CSS = """
    Screen {
        align: center middle;
    }

    ListView {
        width: 30;
        height: auto;
    }
    """

    def compose(self) -> ComposeResult:
        yield ListView(
            ListItem(Label("One")),
            ListItem(Label("Two")),
            ListItem(Label("Three")),
        )

    @on(ListView.Highlighted)
    def notify_highlighted_label(self, event: ListView.Highlighted) -> None:
        highlighted = event.item
        self.notify(str(highlighted))


if __name__ == "__main__":
    app = ListViewExample()
    app.run()

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[TomJGooding]

Actually on reflection I don't think this is really necessary. ListItem is just a widget and querying the children is already covered elsewhere in the docs.

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