fix copyright

Author: gbencedi

PWGMM/Mult/Tasks/dndeta-mft-pbpb.cxx

@@ -8,8 +8,7 @@
 // In applying this license CERN does not waive the privileges and immunities
 // granted to it by virtue of its status as an Intergovernmental Organization
 // or submit itself to any jurisdiction.
-
-///
+//
 /// \brief  Task for calculating dNdeta in Pb-Pb collisions using MFT detector
 /// \author Gyula Bencedi, [email protected]
 /// \since  Nov 2024