telnetd: give inetd.conf example in --help

function                                             old     new   delta
packed_usage                                       33537   33522     -15

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

networking/telnetd.c

@@ -109,6 +109,7 @@
 //usage:     "\n	-i		Inetd mode"
 //usage:	IF_FEATURE_TELNETD_INETD_WAIT(
 //usage:     "\n	-w SEC		Inetd 'wait' mode, linger time SEC"
+//usage:     "\n		inetd.conf line: 23 stream tcp wait root telnetd telnetd -w10"
 //usage:     "\n	-S		Log to syslog (implied by -i or without -F and -w)"
 //usage:	)
 //usage:	)