Fixed several incorrect printf format specifiers

modules/core/include/opencv2/core/operations.hpp

@@ -392,6 +392,17 @@ template<typename _Tp> static inline _Tp randu()
 The function acts like sprintf but forms and returns an STL string. It can be used to form an error
 message in the Exception constructor.
 @param fmt printf-compatible formatting specifiers.
+
+**Note**:
+|Type|Specifier|
+|-|-|
+|`const char*`|`%s`|
+|`char`|`%c`|
+|`float` / `double`|`%f`,`%g`|
+|`int`, `long`, `long long`|`%d`, `%ld`, ``%lld`|
+|`unsigned`, `unsigned long`, `unsigned long long`|`%u`, `%lu`, `%llu`|
+|`uint64` -> `uintmax_t`, `int64` -> `intmax_t`|`%ju`, `%jd`|
+|`size_t`|`%zu`|
  */
 CV_EXPORTS String format( const char* fmt, ... ) CV_FORMAT_PRINTF(1, 2);