Added note about theme asset bundle to bootstrap widgets guide

docs/guide/bootstrap-widgets.md

@@ -21,40 +21,28 @@ convenient way to include bootstrap assets in your pages with a single line adde
 public $depends = array(
 	'yii\web\YiiAsset',
 	'yii\bootstrap\BootstrapAsset', // this line
+	// 'yii\bootstrap\BootstrapThemeAsset' // uncomment to apply bootstrap 2 style to bootstrap 3
 );
 ```
 
-Using bootstrap through Yii asset manager allows you to combine and minimize its resources with your own ones when
+Using bootstrap through Yii asset manager allows you to minimize its resources and combine with your own resources when
 needed.
 
 Yii widgets
 -----------
 
 Most complex bootstrap components are wrapped into Yii widgets to allow more robust syntax and integrate with
-framework features. All widgets belong to `\yii\bootstrap` namespace. Let's review these.
-
-### Alert
-
-### Button
-
-### ButtonDropdown
-
-### ButtonGroup
-
-### Carousel
-
-### Collapse
-
-### Dropdown
-
-### Modal
-
-### Nav
-
-### NavBar
-
-### Progress
-
-### Tabs
-
-### Typeahead
+framework features. All widgets belong to `\yii\bootstrap` namespace:
+
+- Alert
+- Button
+- ButtonDropdown
+- ButtonGroup
+- Carousel
+- Collapse
+- Dropdown
+- Modal
+- Nav
+- NavBar
+- Progress
+- Tabs