Docs: fix QtWin namespace links in the overview

Change-Id: I9651741d07f16be30e29cfb6cd96af527407ccd5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/winextras/doc/src/qtwinextras-overview.qdoc

@@ -41,7 +41,7 @@
 
     \section1 Type Conversion
 
-    The QWinExtras namespace provides functions to convert Qt objects of classes
+    The QtWin namespace provides functions to convert Qt objects of classes
     such as QPixmap or QImage to Windows HBITMAP or HICON handles, and vice
     versa.
 
@@ -50,8 +50,8 @@
     You can determine whether a window is included in the DWM Flip3D rendering.
 
     The glass frame that was first introduced with Windows Vista can be easily
-    manipulated using the QWinExtras::extendFrameIntoClientArea() and
-    QWinExtras::enableBlurBehindWindow() functions. Windows 8 lost the glass
+    manipulated using the QtWin::extendFrameIntoClientArea() and
+    QtWin::enableBlurBehindWindow() functions. Windows 8 lost the glass
     effect, but applications can still integrate their windows into the system
     frame to visually separate window controls from the rest of the window or to
     focus the user's attention on window content.
@@ -66,7 +66,7 @@
     without actually switching to it. You can enable Aero Peek for a
     gadget-like window or for a window that constantly displays monitoring data.
 
-    You can use the QWinExtras::setWindowExcludedFromPeek() function to exclude
+    You can use the QtWin::setWindowExcludedFromPeek() function to exclude
     an application window from Aero Peek.
 
     \note Aero Peek is disabled in Windows 8 by default but can be enabled