Fix DialogContainer docs not appearing in prod

Author: devongovett

packages/@react-spectrum/dialog/docs/DialogContainer.mdx

@@ -32,7 +32,6 @@ import Edit from '@spectrum-icons/workflow/Edit';
 ---
 category: Overlays
 keywords: [dialog container, dialog, modal]
-after_version: 3.3.0
 ---
 
 # DialogContainer