doc: add transform stream destroy() return value

PR-URL: #32788
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: cjihrig

doc/api/stream.md

@@ -1474,6 +1474,7 @@ added: v8.0.0
 -->
 
 * `error` {Error}
+* Returns: {this}
 
 Destroy the stream, and optionally emit an `'error'` event. After this call, the
 transform stream would release any internal resources.