fix: update .changeset/stupid-peas-juggle.md

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

.changeset/stupid-peas-juggle.md

@@ -2,7 +2,7 @@
 'astro': minor
 ---
 
-Supports setting rootMargin for the `client:visible` directive.
+Extends the `client:visible` directive by adding an optional `rootMargin` property. This allows a component to be hydrated when it is close to the viewport instead of waiting for it to become visible.
 
 ```html
 <!-- Load component when it's within 200px away from entering the viewport -->