Minor typo repaired

Changed "the text of the brand of false" into "the text of the brand or false"

NavBar.php

@@ -56,7 +56,7 @@ class NavBar extends Widget
      */
     public $containerOptions = [];
     /**
-     * @var string|boolean the text of the brand of false if it's not used. Note that this is not HTML-encoded.
+     * @var string|boolean the text of the brand or false if it's not used. Note that this is not HTML-encoded.
      * @see http://getbootstrap.com/components/#navbar
      */
     public $brandLabel = false;