message: Typo fix: CV.rabCutClasses to CV.grabCutClasses
diff: @@ -59,7 +59,7 @@ Demo
  We use the function: **cv.grabCut (image, mask, rect, bgdModel, fgdModel, iterCount, mode = cv.GC_EVAL)**
  @param image input 8-bit 3-channel image.
  -@param mask input/output 8-bit single-channel mask. The mask is initialized by the function when mode is set to GC_INIT_WITH_RECT. Its elements may have one of the cv.rabCutClasses.
  +@param mask input/output 8-bit single-channel mask. The mask is initialized by the function when mode is set to GC_INIT_WITH_RECT. Its elements may have one of the cv.grabCutClasses.
  @param rect ROI containing a segmented object. The pixels outside of the ROI are marked as "obvious background". The parameter is only used when mode==GC_INIT_WITH_RECT.
  @param bgdModel temporary array for the background model. Do not modify it while you are processing the same image.
  @param fgdModel temporary arrays for the foreground model. Do not modify it while you are processing the same image.
  