remove after version (#2854)

Author: dannify

packages/@react-spectrum/contextualhelp/docs/ContextualHelp.mdx

@@ -25,7 +25,6 @@ import {Flex} from '@react-spectrum/layout';
 ---
 category: Overlays
 keywords: [popover, field, input]
-after_version: 3.0.0-alpha.1
 ---
 
 # ContextualHelp