tools/memory-model: Repair parseargs.sh header comment

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/memory-model/scripts/parseargs.sh

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0+
 #
-# the corresponding .litmus.out file, and does not judge the result.
+# Parse arguments common to the various scripts.
 #
 # . scripts/parseargs.sh
 #