message: docs: fix typo in Architecture overview page
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diff: @@ -51,7 +51,7 @@ The `@Component()` decorator identifies the class immediately below it as a comp
  A template combines HTML with Angular markup that can modify HTML elements before they are displayed.
  Template *directives* provide program logic, and *binding markup* connects your application data and the DOM.
  -There are tow types of data binding:
  +There are two types of data binding:
  * *Event binding* lets your app respond to user input in the target environment by updating your application data.
  * *Property binding* lets you interpolate values that are computed from your application data into the HTML.
  