Update index.html

Co-authored-by: Copilot <[email protected]>

Author: scottaohara

index.html

@@ -10219,7 +10219,7 @@ <h5>Presentational Role Inheritance</h5>
               Authors SHOULD associate a <code>tabpanel</code> <a>element</a> with its <rref>tab</rref>, by using the <pref>aria-controls</pref> attribute on the tab to reference the tab panel, and/or
               by using the <pref>aria-labelledby</pref> attribute on the tab panel to reference the tab.
             </p>
-			<!-- /end sync with counterpart in #tab -->
+            <!-- /end sync with counterpart in #tab -->
             <p>Authors SHOULD ensure the <rref>tabpanel</rref> associated with the currently active tab is <a>perceivable</a> to the user.</p>
             <!-- keep following para synced with its counterpart in #tablist -->
             <p>