message: Fix an error in the documentation.
diff: @@ -2287,9 +2287,9 @@ public:
  UMat colRange(int startcol, int endcol) const;
  UMat colRange(const Range& r) const;
  //! ... for the specified diagonal
  - // (d=0 - the main diagonal,
  - // >0 - a diagonal from the lower half,
  - // <0 - a diagonal from the upper half)
  + //! (d=0 - the main diagonal,
  + //! >0 - a diagonal from the upper half,
  + //! <0 - a diagonal from the lower half)
  UMat diag(int d=0) const;
  //! constructs a square diagonal matrix which main diagonal is vector "d"
  static UMat diag(const UMat& d);
  