Submitted by: John Capo

Bogus pstat usage message from pstat:
usage: pstat -Tfnstv [system] [-M core] [-N system]

[system] is not mentioned in the man page and I don't
see where it is used in the code either.
Added also a [] around the first options to show them as optional, ATS.

usr.sbin/pstat/pstat.c

@@ -1073,6 +1073,6 @@ void
 usage()
 {
 	(void)fprintf(stderr,
-	    "usage: pstat -Tfnstv [system] [-M core] [-N system]\n");
+	    "usage: pstat [-Tfnstv] [-M core] [-N system]\n");
 	exit(1);
 }