autocomplete

src/pages/components/dropdown/usage.mdx

@@ -829,6 +829,9 @@ boxes are useful when the data populating the list may come from a database.
 - The menu opens by clicking anywhere in the field and you can start typing to
   sort through the list of options. The option that best matches the typed
   characters is highlighted.
+- Autocomplete is also available. As users type, options are filtered to match
+  the typed characters, with the best-matching option being focused and
+  displayed in full.
 - After typing text in the field, the close (x) icon appears to the right of the
   text in the field. This clears any text that’s been entered in the field.