Fix some qdoc-warnings.

qtbase/src/widgets/kernel/qaction.cpp:1257: warning: Can't link to 'QApplication::setAttribute()'
qtbase/src/widgets/kernel/qapplication.cpp:519: warning: Can't link to 'arguments()'
qtbase/src/widgets/kernel/qapplication.cpp:1939: warning: Can't link to 'quit()'
qtbase/src/widgets/kernel/qapplication.cpp:2946: warning: Can't link to 'quit()'
qtbase/src/widgets/kernel/qapplication.cpp:2946: warning: Can't link to 'exit()'
qtbase/src/widgets/kernel/qapplication.cpp:2946: warning: Can't link to 'processEvents()'
qtbase/src/widgets/widgets/qmenu.cpp:1354: warning: Can't link to 'Recent Files Example'
qtbase/examples/widgets/doc/src/tetrix.qdoc:28: warning: Can't link to 'QApplication::quit()'
qtbase/src/testlib/qtestcase.cpp:268: warning: Undocumented parameter 'timeout' in QTRY_VERIFY2_WITH_TIMEOUT()
qtbase/src/corelib/global/qnamespace.qdoc:2427: warning: Can't link to 'QApplication::setLayoutDirection()'
qtbase/src/corelib/global/qnamespace.qdoc:751: warning: Can't link to 'QApplication::setDesktopSettingsAware()'

Change-Id: Ic8170a40fb1cd84e3fb4dd75d9429f4b485f8bd9
Reviewed-by: Martin Smith <martin.smith@digia.com>

examples/widgets/doc/src/tetrix.qdoc

@@ -108,7 +108,7 @@
 
     We connect \l{QAbstractButton::}{clicked()} signals from the \uicontrol{Start}
     and \uicontrol{Pause} buttons to the board, and from the \uicontrol{Quit} button to the
-    application's \l{QApplication::}{quit()} slot.
+    application's \l{QCoreApplication::quit()} slot.
 
     \snippet widgets/tetrix/tetrixwindow.cpp 4
     \snippet widgets/tetrix/tetrixwindow.cpp 5

src/corelib/global/qnamespace.qdoc

@@ -772,7 +772,7 @@
     \value UI_FadeTooltip Show tooltip fading effects.
     \value UI_AnimateToolBox Reserved
 
-    \sa QApplication::setEffectEnabled(), QApplication::setDesktopSettingsAware()
+    \sa QApplication::setEffectEnabled(), QGuiApplication::setDesktopSettingsAware()
 */
 
 /*! \enum Qt::AspectRatioMode
@@ -2443,7 +2443,7 @@
     When LayoutDirectionAuto is used in conjunction with text layouting, it will imply that the text
     directionality is determined from the content of the string to be layouted.
 
-    \sa QApplication::setLayoutDirection(), QWidget::setLayoutDirection(), QTextOption::setTextDirection(), QString::isRightToLeft()
+    \sa QGuiApplication::setLayoutDirection(), QWidget::setLayoutDirection(), QTextOption::setTextDirection(), QString::isRightToLeft()
 */
 
 /*!

src/testlib/qtestcase.cpp

@@ -272,7 +272,7 @@ static void stackTrace()
 
    The QTRY_VERIFY2_WITH_TIMEOUT macro is similar to QTRY_VERIFY_WITH_TIMEOUT()
    except that it outputs a verbose \a message when \a condition is still false
-   after the specified timeout. The \a message is a plain C string.
+   after the specified \a timeout. The \a message is a plain C string.
 
    Example:
    \code

src/widgets/kernel/qaction.cpp

@@ -1270,7 +1270,7 @@ QAction::MenuRole QAction::menuRole() const
     For example:
     \snippet code/src_gui_kernel_qaction.cpp 0
 
-    \sa QAction::icon, QApplication::setAttribute()
+    \sa QAction::icon, QCoreApplication::setAttribute()
 */
 void QAction::setIconVisibleInMenu(bool visible)
 {

src/widgets/kernel/qapplication.cpp

@@ -558,7 +558,7 @@ void QApplicationPrivate::process_cmdline()
             and will make the application wait until a debugger connects to it.
     \endlist
 
-    \sa arguments()
+    \sa QCoreApplication::arguments()
 */
 
 #ifdef Q_QDOC
@@ -1951,7 +1951,7 @@ bool QApplicationPrivate::tryCloseAllWindows()
     \l quitOnLastWindowClosed to false.
 
     \sa quitOnLastWindowClosed, lastWindowClosed(), QWidget::close(),
-    QWidget::closeEvent(), lastWindowClosed(), quit(), topLevelWidgets(),
+    QWidget::closeEvent(), lastWindowClosed(), QCoreApplication::quit(), topLevelWidgets(),
     QWidget::isWindow()
 */
 void QApplication::closeAllWindows()
@@ -2969,8 +2969,8 @@ int QApplication::startDragDistance()
     application will have time to exit its event loop and execute code at the
     end of the \c{main()} function, after the QApplication::exec() call.
 
-    \sa quitOnLastWindowClosed, quit(), exit(), processEvents(),
+    \sa quitOnLastWindowClosed, QCoreApplication::quit(), QCoreApplication::exit(),
-        QCoreApplication::exec()
+        QCoreApplication::processEvents(), QCoreApplication::exec()
 */
 int QApplication::exec()
 {

src/widgets/widgets/qmenu.cpp

@@ -1443,7 +1443,7 @@ void QMenu::initStyleOption(QStyleOptionMenuItem *option, const QAction *action)
     addSeparator(), and addMenu().
 
     \sa QMenuBar, {fowler}{GUI Design Handbook: Menu, Drop-Down and Pop-Up},
-        {Application Example}, {Menus Example}, {Recent Files Example}
+        {Application Example}, {Menus Example}
 */