Update .changeset/thirty-beds-smoke.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

.changeset/thirty-beds-smoke.md

@@ -5,7 +5,7 @@
 
 Changes Astro's internal syntax highlighting to use rehype plugins instead of remark plugins. This provides better interoperability with other [rehype plugins](https://github.com/rehypejs/rehype/blob/main/doc/plugins.md#list-of-plugins) that deal with code blocks, in particular with third party syntax highlighting plugins and [`rehype-mermaid`](https://github.com/remcohaszing/rehype-mermaid).
 
-This may be a breaking change if your are currently using:
+This may be a breaking change if you are currently using:
 - a remark plugin that relies on nodes of type `html`
 - a rehype plugin that depends on nodes of type `raw`.