Clarify documentation about QContactDetail::isEmpty()
Clarify documentation about QContactDetail::isEmpty()

Change-Id: Ibf23953d139ff308994fa5747cde5946f93e637c
Task-number: QTMOBILITY-318
Reviewed-by: Chris Adams

tmcguire/qt-mobility,tmcguire/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,KDE/android-qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,KDE/android-qt-mobility,KDE/android-qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility