QAudioSink does not use the default device if no audioDevice is provided

The documentation about the primary QAudioSink constructor says that the "default audio output device is used".

The actual constructor, instead, seems to use a null constructor instead:

QAudioSink::QAudioSink(const QAudioFormat &format, QObject *parent)
    : QAudioSink({}, format, parent)
{{{}}
}

This is a problem on both implementation and documentation matters; in the former case, that's certainly not the expected behavior (a null audio device should be explicitly set, not implied), and in the latter is a quite important inaccuracy (even ignoring the above point, this should be clarified: "default audio output" is not "null").

Related link: https://stackoverflow.com/q/78813171/2001654