docs: intro formatting update, minor cleanup

modules/core/include/opencv2/core/base.hpp

@@ -352,7 +352,7 @@ This macro can be used to construct an error message on-fly to include some dyna
 for example:
 @code
     // note the extra parentheses around the formatted text message
-    CV_Error_( CV_StsOutOfRange,
+    CV_Error_(Error::StsOutOfRange,
     ("the value at (%d, %d)=%g is out of range", badPt.x, badPt.y, badValue));
 @endcode
 @param code one of Error::Code

modules/core/include/opencv2/core/utility.hpp

@@ -519,7 +519,7 @@ static inline size_t divUp(size_t a, unsigned int b)
 
 /** @brief Enables or disables the optimized code.
 
-The function can be used to dynamically turn on and off optimized code (code that uses SSE2, AVX,
+The function can be used to dynamically turn on and off optimized dispatched code (code that uses SSE4.2, AVX/AVX2,
 and other instructions on the platforms that support it). It sets a global flag that is further
 checked by OpenCV functions. Since the flag is not checked in the inner OpenCV loops, it is only
 safe to call the function on the very top level in your application where you can be sure that no