message: Imgproc: Fix doxygen typo
diff: @@ -2199,7 +2199,7 @@ case of multi-channel images, each channel is processed independently.
  @param src input image; the number of channels can be arbitrary, but the depth should be one of
  CV_8U, CV_16U, CV_16S, CV_32F or CV_64F.
  @param dst output image of the same size and type as src.
  -@param kernel structuring element used for dilation; if elemenat=Mat(), a 3 x 3 rectangular
  +@param kernel structuring element used for dilation; if element=Mat(), a 3 x 3 rectangular
  structuring element is used. Kernel can be created using #getStructuringElement
  @param anchor position of the anchor within the element; default value (-1, -1) means that the
  anchor is at the element center.
  