Documentation does not make it clear that cv::pow() does not handle special values (NaN, Inf) in general (Patch #1739)

The implementation of cv::pow() uses cv::log() and cv::exp() to handle general exponents (i.e. non-integral exponents, apart from +/-0.5). These functions do not handle special values (NaN, Inf), and so neither does cv::pow() in general. While the documentation states that cv::log() and cv::exp() do not handle special values, it does not state that cv::pow() does not handle these values in general.

It may not be obvious to users who haven't looked at the OpenCV source code that cv::pow() relies on cv::log() and cv::exp(), so please update the documentation to state that cv::pow() doesn't generally handle special values (if it had stated this, it would have saved me time tracking down a bug in some code I've written that uses cv::pow()!).