add new exports to changeset

Author: joshfarrant

.changeset/curly-guests-sell.md

@@ -2,4 +2,9 @@
 '@primer/react-brand': patch
 ---
 
-Fixed a bug in the `Link` component where the underline wouldn't take the full width when `arrowDirection='none'`
+`Link` component improvements.
+
+- Fixed a bug in the `Link` component where the underline wouldn't take the full width when `arrowDirection='none'`.
+- Prop options are also now exported from the package root, specifically:
+  - `LinkSizes`
+  - `LinkArrowDirections`