error-reporting: Fix README typos showing usage (#2316)

packages/error-reporting/README.md

@@ -166,10 +166,10 @@ errors.report('My error message');
 
 ```js
 var express = require('express');
-var app = express();
-// Will create an errors instance based off env variables
 var errors = require('@google-cloud/error-reporting')();
 
+var app = express();
+
 app.get('/error', (req, res, next) => {
   res.send('Something broke!');
   next(new Error('Custom error message'));
@@ -203,15 +203,16 @@ server.route({
   }
 });
 
-server.register({ register: errors.hapi });
+server.register(errors.hapi);
 ```
 
 ### Using Koa
 
 ```js
+var Koa = require('koa');
 var errors = require('@google-cloud/error-reporting')();
-var koa = require('koa');
-var app = koa();
+
+var app = new Koa();
 
 app.use(errors.koa);
 
@@ -231,20 +232,20 @@ app.listen(3000);
 ### Using Restify
 
 ```js
+var restify = require('restify');
+var errors = require('@google-cloud/error-reporting')();
+
 function respond(req, res, next) {
   next(new Error('this is a restify error'));
 }
 
-var restify = require('restify');
-var errors = require('@google-cloud/error-reporting')();
-
 var server = restify.createServer();
 
 server.use(errors.restify(server));
 server.get('/hello/:name', respond);
 server.head('/hello/:name', respond);
 
-server.listen(8080);
+server.listen(3000);
 ```
 
 [gcloud-sdk]: https://cloud.google.com/sdk/gcloud/