docs(select): fix formatting of and placement of selectAs/trackAs explanation

src/ng/directive/select.js

@@ -41,6 +41,20 @@ var ngOptionsMinErr = minErr('ngOptions');
  * or property name (for object data sources) of the value  within the collection.
  * </div>
  *
+ * **Note:** Using `select as` together with `trackexpr` is not possible (and will throw).
+ * Reasoning:
+ * - Example: &lt;select ng-options="item.subItem as item.label for item in values track by item.id" ng-model="selected"&gt;
+ *   values: [{id: 1, label: 'aLabel', subItem: {name: 'aSubItem'}}, {id: 2, label: 'bLabel', subItem: {name: 'bSubItemß'}}],
+ *   $scope.selected = {name: 'aSubItem'};
+ * - track by is always applied to `value`, with purpose to preserve the selection,
+ *   (to `item` in this case)
+ * - to calculate whether an item is selected we do the following:
+ *   1. apply `track by` to the values in the array, e.g.
+ *      In the example: [1,2]
+ *   2. apply `track by` to the already selected value in `ngModel`:
+ *      In the example: this is not possible, as `track by` refers to `item.id`, but the selected
+ *      value from `ngModel` is `{name: aSubItem}`.
+ *
  * @param {string} ngModel Assignable angular expression to data-bind to.
  * @param {string=} name Property name of the form under which the control is published.
  * @param {string=} required The control is considered valid only if value is entered.
@@ -77,23 +91,6 @@ var ngOptionsMinErr = minErr('ngOptions');
  *      used to identify the objects in the array. The `trackexpr` will most likely refer to the
  *     `value` variable (e.g. `value.propertyName`). With this the selection is preserved
  *      even when the options are recreated (e.g. reloaded from the server).
-
- * <div class="alert alert-info">
- * **Note:** Using `select as` together with `trackexpr` is not possible (and will throw).
- * Reasoning:
- * - Example: <select ng-options="item.subItem as item.label for item in values track by item.id" ng-model="selected">
- *   values: [{id: 1, label: 'aLabel', subItem: {name: 'aSubItem'}}, {id: 2, label: 'bLabel', subItem: {name: 'bSubItemß'}}],
- *   $scope.selected = {name: 'aSubItem'};
- * - track by is always applied to `value`, with purpose to preserve the selection,
- *   (to `item` in this case)
- * - to calculate whether an item is selected we do the following:
- *   1. apply `track by` to the values in the array, e.g.
- *      In the example: [1,2]
- *   2. apply `track by` to the already selected value in `ngModel`:
- *      In the example: this is not possible, as `track by` refers to `item.id`, but the selected
- *      value from `ngModel` is `{name: aSubItem}`.
- *
- * </div>
  *
  * @example
     <example module="selectExample">