Fix some qdoc warnings: typos and qdoc syntax

Change-Id: Idf5c1490330e0f2e5d4bcf920eb03fc9993b3c8a
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

examples/sql/doc/src/drilldown.qdoc

@@ -438,7 +438,7 @@
     \snippet drilldown/imageitem.h 0
 
     We declare a \c Type enum value for our custom item and reimplement
-    \l{QGreaphicsItem::}{type()}. This is done so we can safely use
+    \l{QGraphicsItem::}{type()}. This is done so we can safely use
     qgraphicsitem_cast().
     In addition, we implement a public \c id() function to be able to
     identify the associated location and a public \c adjust() function

src/corelib/kernel/qvariant.cpp

@@ -2118,7 +2118,7 @@ bool QVariant::view(int type, void *ptr)
     \li If one type is numeric and the other one a QString, Qt will try to
     convert the QString to a matching numeric type and if successful compare
     those.
-    \i If both variants contain pointers to QObject derived types, QVariant
+    \li If both variants contain pointers to QObject derived types, QVariant
     will check whether the types are related and point to the same object.
     \endlist
 */
@@ -2700,7 +2700,7 @@ QDebug operator<<(QDebug dbg, const QVariant::Type p)
     \class QVariantConstPointer
     \since 6.0
     \inmodule QtCore
-    \brief Emulated const pointer to QVariant based on a pointer
+    \brief Emulated const pointer to QVariant based on a pointer.
 
     QVariantConstPointer wraps a QVariant and returns it from its operator*().
     This makes it suitable as replacement for an actual const pointer. We cannot
@@ -2737,7 +2737,7 @@ const QVariant *QVariantConstPointer::operator->() const
     \class QVariantPointer
     \since 6.0
     \inmodule QtCore
-    \brief Emulated pointer to QVariant based on a pointer
+    \brief Emulated pointer to QVariant based on a pointer.
 
     QVariantConstPointer wraps a pointer and returns QVariantRef to it from its
     operator*(). This makes it suitable as replacement for an actual pointer. We

src/corelib/tools/qmargins.cpp

@@ -315,7 +315,7 @@ QT_BEGIN_NAMESPACE
     \relates QMargins
 
     Returns a QMargins object that is formed from the maximum of each
-    component of \a m2 and a m1.
+    component of \a m2 and \a m1.
 
     \sa QMargins::operator+=(), QMargins::operator-=()
 
@@ -668,7 +668,7 @@ QDebug operator<<(QDebug dbg, const QMargins &m)
     \overload
 
     Returns a QMarginsF object that is formed from the maximum of each
-    component of \a m2 and a m1.
+    component of \a m2 and \a m1.
 
     \sa QMarginsF::operator+=(), QMarginsF::operator-=()
 

src/gui/kernel/qwindowsysteminterface.cpp

@@ -633,7 +633,7 @@ void QWindowSystemInterface::registerInputDevice(const QInputDevice *device)
 /*!
     \internal
     Convert a list of \l QWindowSystemInterface::TouchPoint \a points to a list
-    of \em temporary QEventPoint instances, scaled (but not localized)
+    of \e temporary QEventPoint instances, scaled (but not localized)
     for delivery to the given \a window.
 
     This is called from QWindowSystemInterface::handleTouchEvent():

src/widgets/kernel/qapplication.cpp

@@ -528,8 +528,6 @@ void qt_init_tooltip_palette()
 extern void qRegisterWidgetsVariant();
 
 /*!
-  \fn void QApplicationPrivate::initialize()
-
   Initializes the QApplication object, called from the constructors.
 */
 void QApplicationPrivate::initialize()