Fix typo.

modules/perception/obstacle/camera/tracker/cs2d/cs2d_affinity_tracker.cc

@@ -86,7 +86,7 @@ bool CS2DAffinityTracker::GetAffinityMatrix(
 
   return true;
 }
-// TODO(unknown): dummy implementation for pure virtual methdo in base class
+// TODO(unknown): dummy implementation for pure virtual method in base class
 bool CS2DAffinityTracker::UpdateTracked(const cv::Mat &img,
                                          const std::vector<Detected> &detected,
                                          std::vector<Tracked> *tracked) {