Update api-reference.mdx (#8373)

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

src/content/docs/en/reference/api-reference.mdx

@@ -369,9 +369,13 @@ If true, the cookie is only set on https sites.
 Allows customizing how the cookie is serialized.
 
 ### `Astro.redirect()`
-`Astro.redirect()` allows you to redirect to another page. 
+
+Allows you to redirect to another page, and optionally provide an [HTTP response status code](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status) as a second parameter.
+
 A page (and not a child component) must `return` the result of `Astro.redirect()` for the redirect to occur.
 
+The following example redirects a user to a login page, using the default HTTP response status code 302:
+
 ```astro title="src/pages/account.astro" {8}
 ---
 import { isLoggedIn } from '../utils';