Update content/guides/rails/migration-guides/primer-css-select-menu.mdx

Co-authored-by: Joyce Zhu <joycezhu@github.com>

content/guides/rails/migration-guides/primer-css-select-menu.mdx

@@ -109,7 +109,7 @@ When using the `:remote` fetch strategy in combination with single- or multi-sel
 
 ### Loading behavior
 
-The `SelectPanel` component automatically displays spinners during initial and subsequent remote fetches and announces when requests have succeeded or failed. There is no need to render custom spinners or make custom announcements as must often be done for `SelectMenu`s.
+The `SelectPanel` component automatically displays `Spinner`s during initial and subsequent remote fetches and announces to screen reader users when requests have succeeded or failed. There is no need to render custom spinners or make custom announcements as must often be done for `SelectMenu`s.
 
 ### Where to go next