Fix typo in mat.hpp

modules/core/include/opencv2/core/mat.hpp

@@ -2418,7 +2418,7 @@ public:
     void copyTo( OutputArray m ) const;
     //! copies those matrix elements to "m" that are marked with non-zero mask elements.
     void copyTo( OutputArray m, InputArray mask ) const;
-    //! converts matrix to another datatype with optional scalng. See cvConvertScale.
+    //! converts matrix to another datatype with optional scaling. See cvConvertScale.
     void convertTo( OutputArray m, int rtype, double alpha=1, double beta=0 ) const;
 
     void assignTo( UMat& m, int type=-1 ) const;