Comment update

examples/Example_Mobius_spectrum.cc

@@ -1,33 +1,13 @@
-/*************************************************************************************
+/*
-    Grid physics library, www.github.com/paboyle/Grid 
+ * Warning: This code illustrative only: not well tested, and not meant for production use
+ * without regression / tests being applied
+ */
 
-    Copyright (C) 2021
-
-Author: Peter Boyle <paboyle@ph.ed.ac.uk>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-    See the full license in the file "LICENSE" in the top level distribution directory
-    *************************************************************************************/
-    /*  END LEGAL */
 #include <Grid/Grid.h>
 
 using namespace std;
 using namespace Grid;
 
-// Flip sign to make prop to p^2, not -p^2 relative to last example
 template<class Gimpl,class Field> class CovariantLaplacianCshift : public SparseMatrixBase<Field>
 {
 public: