complete docs about Nav to include the style

without a `nav-tabs` or `nav-pills` class a nav is not complete. http://getbootstrap.com/components/#nav fixes #6768

complete docs about Nav to include the style
7af1f11b · Carsten Brandt · 6e209cc7 · 7af1f11b
Commit 7af1f11b authored Jan 06, 2015 by Carsten Brandt
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Nav.php extensions/bootstrap/Nav.php +1 -0

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--- a/extensions/bootstrap/Nav.php
+++ b/extensions/bootstrap/Nav.php
@@ -35,6 +35,7 @@ use yii\helpers\Html;
 *             ],
 *         ],
 *     ],
+ *     'options' => ['class' =>'nav-pills'], // set this to nav-tab to get tab-styled navigation
 * ]);
 * ```
 *