tools/starpu_smpi.xslt: --- is not allowed in xml comments

tools/starpu_smpi.xslt

@@ -1,5 +1,5 @@
 <!--
- StarPU --- Runtime system for heterogeneous multicore architectures.
+ StarPU : Runtime system for heterogeneous multicore architectures.
 
  Copyright (C) 2014-2020  Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria