message: add a comment about how to use FindTrackMatching
  add a comment about how to use FindTrackMatching.
  This is to avoid mis-use of this function from external analysis tasks.
diff: @@ -62,6 +62,7 @@ public:
  void InitTender();
  Double_t TestCPV(Double_t dx, Double_t dz, Double_t pt, Int_t charge) ;
  Int_t FindTrackMatching(Int_t mod,TVector3 *locpos,Double_t &dx, Double_t &dz, Double_t &pttrack, Int_t &charge);
  + //this returns track index with a minimum distance between a extrapolated track in current and a PHOS cluster where locpos and mod points.
  protected:
  AliPHOSTenderSupply(const AliPHOSTenderSupply&c);
  