Tutorial corrections.
Tutorial corrections.

stapelberg/libxcb,topcat/xcb-win32,OpenInkpot-archive/iplinux-libxcb,topcat/xcb-win32,stapelberg/libxcb,topcat/xcb-win32,stapelberg/libxcb,OpenInkpot-archive/iplinux-libxcb,topcat/xcb-win32,OpenInkpot-archive/iplinux-libxcb,topcat/xcb-win32