Update article.md

Author: leviding

5-network/03-fetch-progress/article.md

@@ -5,7 +5,7 @@ The `fetch` method allows to track *download* progress.
 
 Please note: there's currently no way for `fetch` to track *upload* progress. For that purpose, please use [XMLHttpRequest](info:xmlhttprequest), we'll cover it later.
 
-To track download progress, we can use `response.body` property. It's  `ReadableStream` -- a special object that provides body chunk-by-chunk, as it comes. Readable streams are described in the [Streams API](https://streams.spec.whatwg.org/#rs-class) specification.
+To track download progress, we can use `response.body` property. It's `ReadableStream` -- a special object that provides body chunk-by-chunk, as it comes. Readable streams are described in the [Streams API](https://streams.spec.whatwg.org/#rs-class) specification.
 
 Unlike `response.text()`, `response.json()` and other methods, `response.body` gives full control over the reading process, and we can count how much is consumed at any moment.