doc: fix typo in webstreams.md

PR-URL: nodejs#47766
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Beth Griggs <bethanyngriggs@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: christiantakle

doc/api/webstreams.md

@@ -1464,7 +1464,7 @@ added: v16.7.0
   contents of the stream.
 
 ```mjs
-import { buffer as arrayBuffer } from 'node:stream/consumers';
+import { arrayBuffer } from 'node:stream/consumers';
 import { Readable } from 'node:stream';
 import { TextEncoder } from 'node:util';