Correction of Typo of 'synch' to 'sync' on first page of tutorial

Just a small typo in the tutorial: "See examples of how to use client-side data binding to build dynamic views of data that change immediately in response to user actions.
See how Angular keeps your views in >>>>>>>>> synch <<<<<<<< with your data without the need for DOM manipulation.
Learn a better, easier way to test your web apps, with Karma and Protractor.
Learn how to use dependency injection and services to make common web tasks, such as getting data into your app, easier."