Documentation for QWidgetItem::controlTypes.

Change-Id: I673b884ac8513714d733411729a7418c19f05682
Reviewed-by: Gabriel de Dietrich <gabriel.dietrich-de@nokia.com>
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>

src/widgets/kernel/qlayoutitem.cpp

@@ -675,6 +675,12 @@ bool QWidgetItem::isEmpty() const
     return wid->isHidden() || wid->isWindow();
 }
 
+/*!
+    Returns the control type associated with the widget for which
+    this size policy applies.
+
+    \sa QSizePolicy::controlType()
+ */
 QSizePolicy::ControlTypes QWidgetItem::controlTypes() const
 {
     return wid->sizePolicy().controlType();