message: Fix: Grammatical mistake
diff: @@ -360,7 +360,7 @@ libraries). If you do not need the support for some of these, you can just freel
  Set the OpenCV environment variable and add it to the systems path {#tutorial_windows_install_path}
  =================================================================
  -First we set an environment variable to make easier our work. This will hold the build directory of
  +First, we set an environment variable to make our work easier. This will hold the build directory of
  our OpenCV library that we use in our projects. Start up a command window and enter:
  @code
  setx -m OPENCV_DIR D:\OpenCV\Build\x86\vc11 (suggested for Visual Studio 2012 - 32 bit Windows)
  