docs(context-menu): update "Basic" example

Author: metonym

docs/src/pages/components/ContextMenu.svx

@@ -12,6 +12,8 @@ In the examples, right click anywhere within the iframe.
 ## Basic
 
 The context menu appears when right-clicking anywhere in the window. Use context menu option for menu items and context menu divider for visual separation.
+
+The root element has `role="menu"`. Set `labelText` or `aria-label` on `ContextMenu` so assistive technologies get a meaningful name. This matters most for the default window-wide behavior (`target` unset), where there is no visible trigger to label the menu with `aria-labelledby`.
 
 <FileSource src="/framed/ContextMenu/ContextMenu" />
 

docs/src/pages/framed/ContextMenu/ContextMenu.svelte

@@ -9,7 +9,7 @@
   import TrashCan from "carbon-icons-svelte/lib/TrashCan.svelte";
 </script>
 
-<ContextMenu>
+<ContextMenu labelText="Menu actions">
   <ContextMenuOption labelText="Copy" shortcutText="⌘C" icon={CopyFile} />
   <ContextMenuOption labelText="Cut" shortcutText="⌘X" icon={Cut} />
   <ContextMenuDivider />