QML Signals and signal handler miscategorization

The signal handlers are in the "Signals" section, but they are actually signal handlers. In the QML documentation, we clearly identify the signal handlers differently from signals. It should reflect that in the documentation as well.

For example: http://doc.qt.nokia.com/4.7-snapshot/qml-mousearea.html

We could create a "Signal Handlers" section for these. It is not necessary to put a signal entry for each signal handler and vice versa because the intended use should be the category.

Signals:
customSignal1 //onCustomSignal1 handler not documented below

Signal handlers:
onClicked //clicked() signal not documented above
onPressed //pressed() signal not documented above