[moved from opencv] Fix documentation of cv::cuda::compare

original commit: https://github.com/opencv/opencv/commit/28e55dc5f379c866e3cdba1414501c516ae53265

modules/cudaarithm/include/opencv2/cudaarithm.hpp

@@ -208,7 +208,7 @@ CV_EXPORTS_W void pow(InputArray src, double power, OutputArray dst, Stream& str
 
 @param src1 First source matrix or scalar.
 @param src2 Second source matrix or scalar.
-@param dst Destination matrix that has the same size and type as the input array(s).
+@param dst Destination matrix that has the same size as the input array(s) and type CV_8U.
 @param cmpop Flag specifying the relation between the elements to be checked:
 -   **CMP_EQ:** a(.) == b(.)
 -   **CMP_GT:** a(.) \> b(.)