Update index.mdx to use the module syntax

Author: vicb

src/content/docs/workers/runtime-apis/streams/index.mdx

@@ -15,7 +15,7 @@ The [Streams API](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API)
 
 <DirectoryListing />
 
-Workers do not need to prepare an entire response body before delivering it to `event.respondWith()`. You can use [`TransformStream`](/workers/runtime-apis/streams/transformstream/) to stream a response body after sending the front matter (that is, HTTP status line and headers). This allows you to minimize:
+Workers do not need to prepare an entire response body before returning a `Response`. You can use [`TransformStream`](/workers/runtime-apis/streams/transformstream/) to stream a response body after sending the front matter (that is, HTTP status line and headers). This allows you to minimize:
 
 * The visitor’s time-to-first-byte.
 * The buffering done in the Worker.