docs(ngRepeat): fix typo

src/ng/directive/ngRepeat.js

@@ -88,7 +88,7 @@
  *     For example: `(name, age) in {'adam':10, 'amalie':12}`.
  *
  *   * `variable in expression track by tracking_expression` – You can also provide an optional tracking function
- *     which can be used to associate the objects in the collection with the DOM elements. If no tractking function
+ *     which can be used to associate the objects in the collection with the DOM elements. If no tracking function
  *     is specified the ng-repeat associates elements by identity in the collection. It is an error to have
  *     more than one tracking function to resolve to the same key. (This would mean that two distinct objects are
  *     mapped to the same DOM element, which is not possible.)