Update wording

Co-authored-by: Sarah Rainsberger <[email protected]>

.changeset/six-scissors-worry.md

@@ -3,4 +3,6 @@
 "astro": minor
 ---
 
-Bumps Shikiji and exposes a new `markdown.shikiConfig.transformers` config option. You can use this option to transform the Shikiji hast (AST format of the generated HTML) to extend the features of the final HTML. See [shikiji's documentation](https://shikiji.netlify.app/guide/transformers) for more details.
+Adds a new `markdown.shikiConfig.transformers` config option. You can use this option to transform the Shikiji hast (AST format of the generated HTML) to customize the final HTML. Also updates Shikiji to the latest stable version.
+
+See [Shikiji's documentation](https://shikiji.netlify.app/guide/transformers) for more details about creating your own custom transformers, and [a list of common transformers](https://shikiji.netlify.app/packages/transformers) you can add directly to your project.