docs: fix tab's change event description for active tab properties

Fixes #5610

PiperOrigin-RevId: 636773653

Author: asyncLiz

docs/components/tabs.md

@@ -402,7 +402,7 @@ Method | Parameters | Returns | Description
 
 Event | Description
 --- | ---
-`change` | Fired when the selected tab changes. The target's selected or selectedItem and previousSelected or previousSelectedItem provide information about the selection change. The change event is fired when a user interaction like a space/enter key or click cause a selection change. The tab selection based on these actions can be cancelled by calling preventDefault on the triggering `keydown` or `click` event.
+`change` | Fired when the selected tab changes. The target's `activeTabIndex` or `activeTab` provide information about the selection change. The change event is fired when a user interaction like a space/enter key or click cause a selection change. The tab selection based on these actions can be cancelled by calling preventDefault on the triggering `keydown` or `click` event.
 
 <!-- mdformat on(autogenerated might break rendering in catalog) -->
 

tabs/internal/tabs.ts

@@ -12,25 +12,25 @@ import {property, query, queryAssignedElements} from 'lit/decorators.js';
 import {ANIMATE_INDICATOR, Tab} from './tab.js';
 
 /**
- * @fires change {Event} Fired when the selected tab changes. The target's selected or
- * selectedItem and previousSelected or previousSelectedItem provide information
- * about the selection change. The change event is fired when a user interaction
- * like a space/enter key or click cause a selection change. The tab selection
- * based on these actions can be cancelled by calling preventDefault on the
- * triggering `keydown` or `click` event. --bubbles
+ * @fires change {Event} Fired when the selected tab changes. The target's
+ * `activeTabIndex` or `activeTab` provide information about the selection
+ * change. The change event is fired when a user interaction like a space/enter
+ * key or click cause a selection change. The tab selection based on these
+ * actions can be cancelled by calling preventDefault on the triggering
+ * `keydown` or `click` event. --bubbles
  *
  * @example
  * // perform an action if a tab is clicked
  * tabs.addEventListener('change', (event: Event) => {
- *   if (event.target.selected === 2)
- *      takeAction();
+ *   if (event.target.activeTabIndex === 2)
+ *     takeAction();
  *   }
  * });
  *
  * // prevent a click from triggering tab selection under some condition
  * tabs.addEventListener('click', (event: Event) => {
  *   if (notReady)
- *      event.preventDefault();
+ *     event.preventDefault();
  *   }
  * });
  *