Update ns-wingdi-devmodew.md

[iPhilip]

Corrected dmDisplayOrientation table. The test code below seems to indicate that the angles are counter-clockwise (not clockwise) from DMDO_DEFAULT.

#include <iostream>
#include <windows.h>

int main()
{
    DEVMODE dm;
    // initialize the DEVMODE structure
    ZeroMemory(&dm, sizeof(dm));
    dm.dmSize = sizeof(dm);

    if (0 != EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm))
    {
        // rotate the display 90 degrees from DMDO_DEFAULT

        DWORD dwCurrentWidth = dm.dmPelsWidth;
        DWORD dwCurrentHeight = dm.dmPelsHeight;
        dm.dmPelsWidth = dwCurrentHeight;
        dm.dmPelsHeight = dwCurrentWidth;
        dm.dmDisplayOrientation = DMDO_90;
        ChangeDisplaySettings(&dm, 0);

        std::cout << "Press Enter to continue..." << std::endl;
        std::cin.get();

        // restore the default orientation

        dm.dmPelsWidth = dwCurrentWidth;
        dm.dmPelsHeight = dwCurrentHeight;
        dm.dmDisplayOrientation = DMDO_DEFAULT;
        ChangeDisplaySettings(&dm, 0);
    }
}

[prmerger-automator]

@iPhilip : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.