Update tutorial.md

Author: justin808

docs/tutorial.md

@@ -83,8 +83,8 @@ foreman start -f Procfile.dev
 
 ![04](https://cloud.githubusercontent.com/assets/20628911/17464921/3c2fdb40-5cf2-11e6-9343-6afa53593a70.png)
 
-Visit http://localhost:5000/hello_world and see your **React On Rails** app running!
-Note, foreman defaults to PORT 5000 unless you set the value of PORT in your environment.
+Visit http://localhost:3000/hello_world and see your **React On Rails** app running!
+Note, foreman defaults to PORT 5000 unless you set the value of PORT in your environment or in the Procfile.
 
 ![05](https://cloud.githubusercontent.com/assets/20628911/17464920/3c2e8ae2-5cf2-11e6-9e30-5ec5f9e2cbc6.png)