[examples] Fix tetra.py comments.
[examples] Fix tetra.py comments.

fperignon/siconos,bremond/siconos,radarsat1/siconos,siconos/siconos,siconos/siconos,siconos/siconos,radarsat1/siconos,radarsat1/siconos,radarsat1/siconos,bremond/siconos,fperignon/siconos,bremond/siconos,siconos/siconos,radarsat1/siconos,bremond/siconos,fperignon/siconos,fperignon/siconos,bremond/siconos,fperignon/siconos