Update listen description inside serve.ts

Close #1500

Author: intellix

addon/ng2/commands/serve.ts

@@ -37,7 +37,7 @@ module.exports = Command.extend({
 
   availableOptions: [
     { name: 'port',                 type: Number,  default: defaultPort,   aliases: ['p'] },
-    { name: 'host',                 type: String,  default: 'localhost',   aliases: ['H'],     description: 'Listens on all interfaces by default' },
+    { name: 'host',                 type: String,  default: 'localhost',   aliases: ['H'],     description: 'Listens on localhost by default' },
     { name: 'proxy',                type: String,                          aliases: ['pr', 'pxy'] },
     { name: 'insecure-proxy',       type: Boolean, default: false,         aliases: ['inspr'], description: 'Set false to proxy self-signed SSL certificates' },
     { name: 'watcher',              type: String,  default: 'events',      aliases: ['w'] },