help text tweaks

function                                             old     new   delta
packed_usage                                       33570   33502     -68

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/ntpd.c

@@ -77,7 +77,7 @@
 //usage:	IF_FEATURE_NTP_AUTH(" [-k KEYFILE] [-p [keyno:N:]PEER]...")
 //usage:#define ntpd_full_usage "\n\n"
 //usage:       "NTP client/server\n"
-//usage:     "\n	-d	Verbose (may be repeated)"
+//usage:     "\n	-d[d]	Verbose"
 //usage:     "\n	-n	Do not daemonize"
 //usage:     "\n	-q	Quit after clock is set"
 //usage:     "\n	-N	Run at high priority"