Bug in documentation example

[Peter Landwehr]

Hello,

I'd like to report a bug in the last example in the polkit reference page (https://www.freedesktop.org/software/polkit/docs/latest/polkit.8.html)

The test of the example is:
```
// Allow users in group 'engineers' to perform any operation on
// some drives without having to authenticate
//
polkit.addRule(function(action, subject) {
    if (action.id.indexOf("org.freedesktop.udisks2.") == 0 &&
        action.lookup("drive.vendor") == "SEAGATE" &&
        action.lookup("drive.model") == "ST3300657SS" &&
        subject.isInGroup("engineers")) {
            return polkit.Result.YES;
        }
    }
});
```
It has one more closing curly-brace than it should.

All the best,

pml

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