chore: remove preview tag from title of Combobox

Author: laske185

docs/30-components/combobox.mdx

@@ -10,7 +10,7 @@ tags:
 import Readme from '../../readmes/combobox/readme.md';
 import { ExampleLink } from '@site/src/components/ExampleLink';
 
-# Combobox `preview`
+# Combobox
 
 Synonyme: Autocomplete, Select, Dropdown