Fixed --authpasswd in check_snmp help

plugins/check_snmp.c

@@ -1243,7 +1243,7 @@ print_help (void)
 	printf ("(%s \"%s\")\n", _("default is") ,DEFAULT_COMMUNITY);
 	printf (" %s\n", "-U, --secname=USERNAME");
 	printf ("    %s\n", _("SNMPv3 username"));
-	printf (" %s\n", "-A, --authpassword=PASSWORD");
+	printf (" %s\n", "-A, --authpasswd=PASSWORD");
 	printf ("    %s\n", _("SNMPv3 authentication password"));
 	printf (" %s\n", "-X, --privpasswd=PASSWORD");
 	printf ("    %s\n", _("SNMPv3 privacy password"));