Fixed unnecessary black spaces;

Extended parallel version to all frameworks supported by OpenCV;
Added some documentation notes in modules/imgproc/include/opencv2/imgproc.hpp;

modules/imgproc/include/opencv2/imgproc.hpp

@@ -3674,8 +3674,10 @@ image with 4 or 8 way connectivity - returns N, the total number of labels [0, N
 represents the background label. ltype specifies the output label image type, an important
 consideration based on the total number of labels or alternatively the total number of pixels in
 the source image. ccltype specifies the connected components labeling algorithm to use, currently
-Grana's (BBDT) and Wu's (SAUF) algorithms are supported, see the cv::ConnectedComponentsAlgorithmsTypes
+Grana (BBDT) and Wu's (SAUF) algorithms are supported, see the cv::ConnectedComponentsAlgorithmsTypes
 for details. Note that SAUF algorithm forces a row major ordering of labels while BBDT does not.
+This function uses parallel version of both Grana and Wu's algorithms if at least one allowed
+parallel framework is enabled.
 
 @param image the 8-bit single-channel image to be labeled
 @param labels destination labeled image
@@ -3706,7 +3708,8 @@ consideration based on the total number of labels or alternatively the total num
 the source image. ccltype specifies the connected components labeling algorithm to use, currently
 Grana's (BBDT) and Wu's (SAUF) algorithms are supported, see the cv::ConnectedComponentsAlgorithmsTypes
 for details. Note that SAUF algorithm forces a row major ordering of labels while BBDT does not.
-
+This function uses parallel version of both Grana and Wu's algorithms (statistics included) if at least one allowed
+parallel framework is enabled.
 
 @param image the 8-bit single-channel image to be labeled
 @param labels destination labeled image