Fix the documentation names.

modules/features2d/doc/object_categorization.rst

@@ -181,13 +181,13 @@ BOWImgDescriptorExtractor::compute
 Computes an image descriptor using the set visual vocabulary.
 
 .. ocv:function:: void BOWImgDescriptorExtractor::compute( const Mat& image, vector<KeyPoint>& keypoints, Mat& imgDescriptor, vector<vector<int> >* pointIdxsOfClusters=0, Mat* descriptors=0 )
-.. ocv:function:: void BOWImgDescriptorExtractor::compute( const Mat& descriptors, Mat& imgDescriptor, std::vector<std::vector<int> >* pointIdxsOfClusters )
+.. ocv:function:: void BOWImgDescriptorExtractor::compute( const Mat& keypointDescriptors, Mat& imgDescriptor, std::vector<std::vector<int> >* pointIdxsOfClusters )
 
     :param image: Image, for which the descriptor is computed.
 
     :param keypoints: Keypoints detected in the input image.
 
-    :param descriptors: Computed descriptors to match with vocabulary.
+    :param keypointDescriptors: Computed descriptors to match with vocabulary.
 
     :param imgDescriptor: Computed output image descriptor.