Added info about local `encode` param which overrides global

Tabs.php

@@ -58,7 +58,8 @@ class Tabs extends Widget
      * tab with the following structure:
      *
      * - label: string, required, the tab header label.
-     * - encode: boolean, optional, whether this label should be HTML-encoded.
+     * - encode: boolean, optional, whether this label should be HTML-encoded. This param will override
+     *   global `$this->encodeLabels` param.
      * - headerOptions: array, optional, the HTML attributes of the tab header.
      * - linkOptions: array, optional, the HTML attributes of the tab header link tags.
      * - content: string, required if `items` is not set. The content (HTML) of the tab pane.