doc: fix typo in pipe from async iterator example

PR-URL: #27870
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/stream.md

@@ -2487,7 +2487,7 @@ const writeable = fs.createWriteStream('./file');
 (async function() {
   for await (const chunk of iterator) {
     // Handle backpressure on write
-    if (!writeable.write(value))
+    if (!writeable.write(chunk))
       await once(writeable, 'drain');
   }
   writeable.end();