[admin] fix help docstring

share/examples/run_testcases_validation

@@ -16,7 +16,7 @@ if [ $# -eq 1 ] && [ "$1" = "-h" ]; then
     echo "  It is intended to be run by cron. By default, the script really does"
     echo "  the job the first friday of each month."
     echo "  Use the option --now to avoid this restriction."
-    echo "  Create the file ${DEV}/codeaster-<branch>/run_validation_next"
+    echo "  Create the file ${DEV}/run_validation_next_<branch>"
     echo "  to force run at the next call."
     echo "  "
     echo "  BRANCH: is 'main' by default or another branch name."