Doc: minor corrections

Change-Id: Idcaac01294642e7e79f6e2b8bcfd2c9559274790
Task-number: QTBUG-43810
Reviewed-by: Martin Smith <martin.smith@digia.com>

src/multimediawidgets/qvideowidget.cpp

@@ -734,7 +734,7 @@ void QVideoWidget::setFullScreen(bool fullScreen)
 
     Signals that the \a fullScreen mode of a video widget has changed.
 
-    \sa fullScreen()
+    \sa isFullScreen()
 */
 
 /*!

src/plugins/avfoundation/camera/avfcamerasession.mm

@@ -220,7 +220,7 @@ void AVFCameraSession::updateCameraDevices()
         //     the screen when held in portrait ==> 270 degrees clockwise angle
         //   - Front-facing cameras have the top side of the sensor aligned with the left side of
         //     the screen when held in portrait ==> 270 degrees clockwise angle
-        // On Mac OS, the position will always be unspecified and the sensor orientation unknown.
+        // On OS X, the position will always be unspecified and the sensor orientation unknown.
         switch (device.position) {
         case AVCaptureDevicePositionBack:
             info.position = QCamera::BackFace;