Using widgets page - countwidgets function has conflicting information

The [Using Widgets](https://docs.bolt.cm/3.3/templating/widgets#other-functionality) page has two different snippets for the `countwidgets` function, which give conflicting information.

The first says _'Note that this function also requires the 'zone' parameter, which is optional in widgets. Zone must be either frontend or backend.'_ and the second says _'This function takes an optional second argument for the 'zone': countwidgets('dashboard_top', 'backend'). Zone must be either frontend or backend.'_

I'm not sure which is correct, but I think it works even without the zone parameter.