qtdoc properties hide NOTIFY signal documentation

The QDnsLookup::errorString property NOTIFY signal is finished(). This makes sense.

QDnsLookup::error property NOTIFY signal is finished(). This also makes sense.

However, qtdoc assumes a one-to-one mapping of Q_PROPERTY to NOTIFY signal. The link to the finished() signal in the error property is a link to the errorString property. This does not make sense.

http://doc.qt.io/qt-5/qdnslookup.html#errorString-prop

Additionally, the detailed description links to the finished() signal but also takes the user to the property documentation. This also does not make sense.

Additionally, the actual documentation of the finished() signal is not extracted to the generated documentation.

http://code.woboq.org/qt5/qtbase/src/network/kernel/qdnslookup.cpp.html#231