message: Remove unnecessary use of ref-capture in code example.
diff: @@ -2100,7 +2100,7 @@ public:
  Mat_<Pixel> image = Mat::zeros(3, sizes, CV_8UC3);
  - image.forEach<Pixel>([&](Pixel& pixel, const int position[]) -> void {
  + image.forEach<Pixel>([](Pixel& pixel, const int position[]) -> void {
  pixel.x = position[0];
  pixel.y = position[1];
  pixel.z = position[2];
  