[Bug Fix] Fix DropdownMenu docs example: replace nonexistent DialogClose

The 'Non-navigational item' example (added in #427) referenced a
DialogClose component that does not exist in the gem. VisualCodeExample
evaluates the snippet at render time, so it raised NoMethodError and the
whole /docs/dropdown_menu page failed to render.

Close the dialog with the documented pattern instead: a Button wired to
click->ruby-ui--dialog#dismiss (same approach used in dialog_docs.rb).

Fixes #428

Author: djalmaaraujo

docs/app/views/docs/dropdown_menu.rb

@@ -43,7 +43,7 @@ def view_template
                       DialogDescription { "This action cannot be undone." }
                     end
                     DialogFooter do
-                      DialogClose { Button(variant: :destructive) { "Delete" } }
+                      Button(variant: :destructive, data: { action: 'click->ruby-ui--dialog#dismiss' }) { "Delete" }
                     end
                   end
                 end