update the docs for cvExtractSURF and initModule_nonfree()
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@ -126,3 +126,5 @@ Detects keypoints and computes SURF descriptors for them.
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:param params: SURF algorithm parameters in OpenCV 1.x API.
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The function is parallelized with the TBB library.
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If you are using the C version, make sure you call ``cv::initModule_nonfree()`` from ``nonfree/nonfree.hpp``.
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