Updated help message removing the term that on "lo" DNS-SD does not work

As a patch for Avahi to support advertising services on localhost is in
the work, we remove this term from the help message.

src/ippusbxd.c

@@ -659,9 +659,7 @@ int main(int argc, char *argv[])
 	   "               taken\n"
 	   "  --interface <interface>\n"
 	   "  -i <interface> Network interface to use. Default is the loopback interface\n"
-	   "               (lo, localhost). As the loopback interface does not allow\n"
-	   "               DNS-SD broadcasting with Avahi, set up the dummy interface\n"
-	   "               (dummy0) for DNS-SD broadcasting.\n"
+	   "               (lo, localhost).\n"
 	   "  --logging\n"
 	   "  -l           Redirect logging to syslog\n"
 	   "  --verbose\n"