docs(ngController): improve wording

src/ng/directive/ngController.js

@@ -10,7 +10,7 @@
  *
  * MVC components in angular:
  *
- * * Model — The Model is scope properties; scopes are attached to the DOM where scope properties
+ * * Model — Models are the properties of a scope; scopes are attached to the DOM where scope properties
  *   are accessed through bindings.
  * * View — The template (HTML with data bindings) that is rendered into the View.
  * * Controller — The `ngController` directive specifies a Controller class; the class contains business