style(ngRepeat): fix typos

Author: Julien Bouquillon

src/ng/directive/ngRepeat.js

@@ -90,7 +90,7 @@
  *   * `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
  *     is specified the ng-repeat associates elements by identity in the collection. It is an error to have
- *     more then one tractking function to  resolve to the same key. (This would mean that two distinct objects are
+ *     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.)
  *
  *     For example: `item in items` is equivalent to `item in items track by $id(item)'. This implies that the DOM elements