Fix typo and add comments to the example app

Examples/Movies/SearchScreen.js

@@ -31,6 +31,11 @@ var MovieScreen = require('./MovieScreen');
 
 var fetch = require('fetch');
 
+/**
+ * This is for demo purposes only, and rate limited.
+ * In case you want to use the Rotten Tomatoes' API on a real app you should
+ * create an account at http://developer.rottentomatoes.com/
+ */
 var API_URL = 'http://api.rottentomatoes.com/api/public/v1.0/';
 var API_KEYS = [
   '7waqfqbprs7pajbz28mqf6vz',

docs/Tutorial.md

@@ -198,7 +198,7 @@ Add the following constants to the top of the file (typically below the requires
 
 ```javascript
 /**
- * For quota reasons we replaced the Roten Tomatoes' API with a sample data of
+ * For quota reasons we replaced the Rotten Tomatoes' API with a sample data of
  * their very own API that lives in React Native's Gihub repo.
  */
 var REQUEST_URL = 'https://raw.githubusercontent.com/facebook/react-native/master/docs/MoviesExample.json';