Merge pull request opencv#18008 from gsmatos:document-patchnans

Author: alalek

modules/core/include/opencv2/core.hpp

@@ -1615,7 +1615,9 @@ elements.
 CV_EXPORTS_W bool checkRange(InputArray a, bool quiet = true, CV_OUT Point* pos = 0,
                             double minVal = -DBL_MAX, double maxVal = DBL_MAX);
 
-/** @brief converts NaN's to the given number
+/** @brief converts NaNs to the given number
+@param a input/output matrix (CV_32F type).
+@param val value to convert the NaNs
 */
 CV_EXPORTS_W void patchNaNs(InputOutputArray a, double val = 0);