Update install_all_dune_modules.sh

bin/install_all_dune_modules.sh

@@ -83,6 +83,6 @@ echo "You can add the following lines to you .bashrc file           "
 echo "  export DUNE_CONTROL_PATH=${PREFIX}                          "
 echo "  export PATH=${PREFIX}/dune-common/bin:\${PATH}              "
 echo "                                                              "
-echo "In order to compile your module, just run                     "
-echo "  duncontrol --opts=${PREFIX}/config.opts --current all       "
+echo "In order to build all modules, run inside the ${PREFIX} dir   "
+echo "  duncontrol --opts=${PREFIX}/config.opts all                 "
 echo "=============================================================="