documentation is wrong for WebEngineCertificateError

the documentation at https://doc.qt.io/qt-6/qml-qtwebengine-webenginecertificateerror.html mentions the property 'error', but that property is always undefinded.

Instead, the property name appears to be 'type', as the docs here indicate https://doc.qt.io/qt-6.2/qwebenginecertificateerror.html