Fixed the link to `@see` method (#166) [skip ci]

BootstrapWidgetTrait.php

@@ -101,7 +101,7 @@ trait BootstrapWidgetTrait
 
     /**
      * @return \yii\web\View the view object that can be used to render views or view files.
-     * @see yii\base\Widget::getView()
+     * @see \yii\base\Widget::getView()
      */
     abstract function getView();
 }