Changed tutorial for installing openCV under VS2010 like bug 3157 suggested

doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.rst

@@ -52,7 +52,9 @@ Use for example the *OpenCV_Debug* name. Then by selecting the sheet :menuselect
 
 .. code-block:: bash
 
-   $(OPENCV_DIR)\include
+   $(OPENCV_DIR)\..\..\include
+   
+Note: the location of the include library is different of the libs folder, so don't forget to add the dots to go to the required parent folder.
 
 .. image:: images/PropertySheetOpenCVInclude.jpg
    :alt: Add the include dir like this.