Update src/content/docs/en/guides/integrations-guide/vercel.mdx

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

src/content/docs/en/guides/integrations-guide/vercel.mdx

@@ -377,7 +377,9 @@ export default defineConfig({
 ### Function bundling configuration
 
 :::caution[Deprecated]
-The `functionPerRoute` option is deprecated and will be removed in Astro 5. Additionally it doesn't work with some Astro features such as i18n domains and request rewriting. It's advised to disable it.
+The `functionPerRoute` option is deprecated and will be removed entirely in Astro 5. Additionally, this option is incompatible with some Astro features such as i18n domains and request rewriting.
+
+If you have currently enabled `functionPerRoute: true`, we recommend removing this configuration option as soon as you are able.
 :::
 
 The Vercel adapter combines all of your routes into a single function by default.