Remove incorrect mention of dropdowns for dynamic tab behavior (#32634)

While technically it still works, we're already saying authors shouldn't do it later on, and we removed any examples of this. This was a straggler.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

site/content/docs/5.0/components/navs-tabs.md

@@ -306,7 +306,7 @@ Add dropdown menus with a little extra HTML and the [dropdowns JavaScript plugin
 
 ## JavaScript behavior
 
-Use the tab JavaScript plugin—include it individually or through the compiled `bootstrap.js` file—to extend our navigational tabs and pills to create tabbable panes of local content, even via dropdown menus.
+Use the tab JavaScript plugin—include it individually or through the compiled `bootstrap.js` file—to extend our navigational tabs and pills to create tabbable panes of local content.
 
 Dynamic tabbed interfaces, as described in the [<abbr title="Web Accessibility Initiative">WAI</abbr> <abbr title="Accessible Rich Internet Applications">ARIA</abbr> Authoring Practices](https://www.w3.org/TR/wai-aria-practices/#tabpanel), require `role="tablist"`, `role="tab"`, `role="tabpanel"`, and additional `aria-` attributes in order to convey their structure, functionality and current state to users of assistive technologies (such as screen readers).