Added missing \since 5.0 and tweaked some docs in QtGui.

Change-Id: I91564f7a61962f97b9fb78c96d94d5695a3924db
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

src/gui/kernel/qevent.cpp

@@ -1146,12 +1146,13 @@ QMoveEvent::~QMoveEvent()
 
 /*!
     \class QExposeEvent
+    \since 5.0
     \brief The QExposeEvent class contains event parameters for expose events.
 
     \ingroup events
 
-    Expose events are sent to widgets when an area of the widget is invalidated
+    Expose events are sent to windows when an area of the window is invalidated
-    and needs to be flushed from the backing store.
+    or window visibility in the windowing system changes.
 
     The event handler QWindow::exposeEvent() receives expose events.
 */
@@ -1761,9 +1762,11 @@ void QInputMethodEvent::setTentativeCommitString(const QString &tentativeCommitS
     \sa setTentativeCommitString()
 */
 
-/*! \class QInputMethodQueryEvent
+/*!
+    \class QInputMethodQueryEvent
+    \since 5.0
 
-    This event is sent by the input context to input objects.
+    \brief This event is sent by the input context to input objects.
 
     It is used by the
     input method to query a set of properties of the object to be

src/gui/kernel/qguiapplication.cpp

@@ -195,6 +195,7 @@ static inline void clearFontUnlocked()
     flow and main settings.
 
     \inmodule QtGui
+    \since 5.0
 
     QGuiApplication contains the main event loop, where all events from the window
     system and other sources are processed and dispatched. It also handles the

src/gui/kernel/qopenglcontext.cpp

@@ -76,6 +76,7 @@ QMutex QOpenGLContextPrivate::makeCurrentTrackerMutex;
 
 /*!
     \class QOpenGLContext
+    \since 5.0
     \brief The QOpenGLContext represents a native OpenGL context, enabling
            OpenGL rendering on a QSurface.
 
@@ -621,6 +622,7 @@ void QOpenGLContext::deleteQGLContext()
 
 /*!
     \class QOpenGLContextGroup
+    \since 5.0
     \brief The QOpenGLContextGroup represents a group of contexts sharing
     OpenGL resources.
 

src/gui/kernel/qscreen.cpp

@@ -50,6 +50,7 @@ QT_BEGIN_NAMESPACE
 
 /*!
     \class QScreen
+    \since 5.0
     \brief The QScreen class is used to query screen properties.
 
     A note on logical vs physical dots per inch: physical DPI is based on the

src/gui/kernel/qstylehints.cpp

@@ -50,6 +50,11 @@ static inline QVariant hint(QPlatformIntegration::StyleHint h)
     return QGuiApplicationPrivate::platformIntegration()->styleHint(h);
 }
 
+/*!
+    \class QStyleHints
+    \since 5.0
+    \brief The QStyleHints contains platform specific hints and settings.
+ */
 QStyleHints::QStyleHints()
     : QObject()
 {

src/gui/kernel/qsurface.cpp

@@ -46,6 +46,7 @@ QT_BEGIN_NAMESPACE
 
 /*!
     \class QSurface
+    \since 5.0
     \brief The QSurface class is an abstraction of renderable surfaces in Qt.
 
     The size of the surface is accessible with the size() function. The rendering

src/gui/kernel/qsurfaceformat.cpp

@@ -108,6 +108,7 @@ public:
 
 /*!
     \class QSurfaceFormat
+    \since 5.0
     \brief The QSurfaceFormat class represents the format of a QSurface.
 
     The format includes the size of the color buffers, red, green, and blue;

src/gui/kernel/qwindow.cpp

@@ -63,6 +63,7 @@ QT_BEGIN_NAMESPACE
 
 /*!
     \class QWindow
+    \since 5.0
     \brief The QWindow class represents a window in the underlying windowing system.
 
     A window that is supplied a parent becomes a native child window of