docs(select): remove obsolete ngOptions equality check comments

src/ng/directive/select.js

@@ -127,12 +127,6 @@ var SelectController =
  * be nested into the `<select>` element. This element will then represent the `null` or "not selected"
  * option. See example below for demonstration.
  *
- * <div class="alert alert-warning">
- * **Note:** By default, `ngModel` compares by reference, not value. This is important when binding to an
- * array of objects. See an example [in this jsfiddle](http://jsfiddle.net/qWzTb/). When using `track by`
- * in an `ngOptions` expression, however, deep equality checks will be performed.
- * </div>
- *
  */
 var selectDirective = function() {