update the documentation for the para

Author: zhangbiao-phy

PWGHF/TableProducer/trackIndexSkimCreator.cxx

@@ -651,6 +651,7 @@ struct HfTrackIndexSkimCreatorTagSelTracks {
 
   /// PID track cuts (for proton only)
   /// \param hfTrack is a track
+  /// \param hfTrackWithIts is a track joined with the ITS PID table      
   /// \return true if the track is compatible with a proton hypothesis
   template <int PidStrategy, typename T, typename TrackWithIts>
   uint8_t isSelectedPid(const T& hfTrack, const TrackWithIts& hfTrackWithIts)