update.php: remove decrypt-feeds mention in help text

update.php

@@ -39,7 +39,6 @@
 			"debug-feed:",
 			"force-refetch",
 			"force-rehash",
-			"decrypt-feeds",
 			"help");
 
 	foreach (PluginHost::getInstance()->get_commands() as $command => $data) {
@@ -92,7 +91,6 @@
 		print "  --debug-feed N       - perform debug update of feed N\n";
 		print "  --force-refetch      - debug update: force refetch feed data\n";
 		print "  --force-rehash       - debug update: force rehash articles\n";
-		print "  --decrypt-feeds      - decrypt feed passwords\n";
 		print "  --help               - show this help\n";
 		print "Plugin options:\n";