message: Solve issue 8136 opencv doc of threshold
diff: @@ -2709,7 +2709,7 @@ CV_EXPORTS_W void createHanningWindow(OutputArray dst, Size winSize, int type);
  /** @brief Applies a fixed-level threshold to each array element.
  -The function applies fixed-level thresholding to a single-channel array. The function is typically
  +The function applies fixed-level thresholding to a multiple-channel array. The function is typically
  used to get a bi-level (binary) image out of a grayscale image ( cv::compare could be also used for
  this purpose) or for removing a noise, that is, filtering out pixels with too small or too large
  values. There are several types of thresholding supported by the function. They are determined by
  @@ -2721,8 +2721,8 @@ or Triangle algorithm and uses it instead of the specified thresh . The function
  computed threshold value. Currently, the Otsu's and Triangle methods are implemented only for 8-bit
  images.
  -@param src input array (single-channel, 8-bit or 32-bit floating point).
  -@param dst output array of the same size and type as src.
  +@param src input array (multiple-channel, 8-bit or 32-bit floating point).
  +@param dst output array of the same size and type and the same number of channels as src.
  @param thresh threshold value.
  @param maxval maximum value to use with the THRESH_BINARY and THRESH_BINARY_INV thresholding
  types.
  