message: Add Dropdown.Button to FilteredSearch example
diff: @@ -9,7 +9,8 @@ The FilteredSearch component helps style a Dropdown and a TextInput side-by-side
  ```jsx live
  <FilteredSearch>
  - <Dropdown title="Filter">
  + <Dropdown>
  + <Dropdown.Button>Filter</Dropdown.Button>
  <Dropdown.Menu direction="sw">
  <Dropdown.Item>Item 1</Dropdown.Item>
  <Dropdown.Item>Item 2</Dropdown.Item>
  