6110 dumpadm usage string should mention '-d none'

@@ -33,12 +33,13 @@
 #include "dconf.h"
 #include "minfree.h"
 #include "utils.h"
 
 static const char USAGE[] = "\
-Usage: %s [-enuy] [-c kernel | curproc | all ] [-d dump-device | swap ]\n\
-        [-m min {k|m|%%} ] [-s savecore-dir] [-r root-dir] [-z on|off]\n";
+Usage: %s [-enuy] [-c kernel | curproc | all ]\n\
+        [-d dump-device | swap | none ] [-m min {k|m|%%} ] [-s savecore-dir]\n\
+        [-r root-dir] [-z on|off]\n";
 
 static const char OPTS[] = "einuyc:d:m:s:r:z:";
 
 static const char PATH_DEVICE[] = "/dev/dump";
 static const char PATH_CONFIG[] = "/etc/dumpadm.conf";