docs(console): the preview-samples note stops naming the retired heading variant as live (objectui#11717)

Claude-Session: https://claude.ai/code/session_01XgevVHGcN8dnegiiY3v75V
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

apps/console/src/__tests__/preview-samples-registry-resolvable.test.ts

@@ -21,7 +21,7 @@
  * is therefore perfectly valid metadata. `{ type: 'heading' }` parsed clean
  * through every spec release while resolving to nothing: `heading` has never
  * been registered in this repo (the nearest real things are `element:text`
- * with `variant: 'heading'`, which renders an h2, and the `ui/typography`
+ * with a heading `variant` such as `h2` (`heading` until 17.7.0 retired it), and the `ui/typography`
  * primitives, which never go through the registry at all). Both `heading`
  * nodes in the `page` sample fell through to the ComponentRegistry fallback,
  * so the gallery's page card — the worked example of a composed page — showed