Misc. modules/ cont. pt2

Found via `codespell`

modules/features2d/src/keypoint.cpp

@@ -78,7 +78,7 @@ void KeyPointsFilter::retainBest(std::vector<KeyPoint>& keypoints, int n_points)
         }
         //first use nth element to partition the keypoints into the best and worst.
         std::nth_element(keypoints.begin(), keypoints.begin() + n_points, keypoints.end(), KeypointResponseGreater());
-        //this is the boundary response, and in the case of FAST may be ambigous
+        //this is the boundary response, and in the case of FAST may be ambiguous
         float ambiguous_response = keypoints[n_points - 1].response;
         //use std::partition to grab all of the keypoints with the boundary response.
         std::vector<KeyPoint>::const_iterator new_end =