Fix wrong example caption

Closes #6284

Author: andresgottlieb

src/components/autocomplete/js/autocompleteDirective.js

@@ -120,8 +120,8 @@ angular
  * </form>
  * </hljs>
  *
- * In this example, our code utilizes `md-item-template` and `md-not-found` to specify the
- *     different parts that make up our component.
+ * In this example, our code utilizes `md-item-template` and `ng-messages` to specify
+ *     input validation for the field.
  */
 
 function MdAutocomplete () {