ii: fix mistake in usage, the host is actually mandatory

Reported by Petr Vaněk <arkamar@atlas.cz>, thanks!

ii.1

@@ -21,10 +21,8 @@ and ii creates a new channel directory with in and out file.
 .IR host >
 .RB [ \-p
 .IR port ]
-|
-.RB < \-u
-.IR sockname >
-
+.RB [ \-u
+.IR sockname ]
 .RB [ \-i
 .IR ircdir ]
 .RB [ \-n

ii.c

@@ -98,7 +98,7 @@ die(const char *fmt, ...)
 static void
 usage(void)
 {
-	die("usage: %s <-s host> [-p <port>] | <-u sockname>\n"
+	die("usage: %s <-s host> [-p <port>] [-u sockname]\n"
 	    "	[-i <ircdir>] "
 	    "	[-n <nick>] [-f <fullname>] [-k <password>]\n", argv0);
 }