fix a few qdoc command typos

Change-Id: I5eb3a6d2bb7939f001f1fcb836660dd46a47c350
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

src/corelib/tools/qeasingcurve.cpp

@@ -55,7 +55,7 @@
     \class QEasingCurve
     \since 4.6
     \ingroup animation
-    \captionief The QEasingCurve class provides easing curves for controlling animation.
+    \caption The QEasingCurve class provides easing curves for controlling animation.
 
     Easing curves describe a function that controls how the speed of the interpolation
     between 0 and 1 should be. Easing curves allow transitions from

src/gui/kernel/qevent.cpp

@@ -553,9 +553,9 @@ QWheelEvent::QWheelEvent(const QPointF &pos, const QPointF& globalPos, int delta
 
     The \a pos provides the location of the mouse cursor
     within the window. The position in global coordinates is specified
-    by \a globalPos. \pixelDelta contains the scrolling distance
+    by \a globalPos. \a pixelDelta contains the scrolling distance
     in pixels on screen, \a angleDelta contains the wheel rotation distance.
-    \pixelDelta is optional and can be null.
+    \a pixelDelta is optional and can be null.
 
     \a modifiers holds the keyboard modifier flags at the time of the event.
 

src/widgets/kernel/qwidget.cpp

@@ -9246,7 +9246,7 @@ int QWidget::heightForWidth(int w) const
 
 
 /*!
-    \Since 5.0
+    \since 5.0
 
     Returns true if the widget's preferred height depends on its width; otherwise returns false.
 */