1.In QGeoAreaMonitor class there is no proper documentation for the folowing methods.

virtual void setCenter ( const QGeoCoordinate & coordinate )
virtual void setRadius ( qreal radius )

these methods are pointing to the following methods.
QGeoCoordinate center () const
qreal radius () const

so does these methods require documentation or the existing NOTE:- written below would be sufficiant.

2.and you can observe a typo also, as the phrase "This property holds" is repeated in the description of center and radius methods.