Update apps/site/pages/en/learn/modules/backpressuring-in-streams.md

Co-authored-by: Aviv Keller <me@aviv.sh>
Signed-off-by: 0hm☘️ <109351887+0hmX@users.noreply.github.com>

Author: 0hmX

apps/site/pages/en/learn/modules/backpressuring-in-streams.md

@@ -559,7 +559,7 @@ class MyReadable extends Readable {
 
 Here is an example of good practice, where the `Readable` stream respects backpressure by checking the return value of `this.push()`:
 
-```javascript
+```js
 class MyReadable extends Readable {
   _read(size) {
     let chunk;