doc: fix typo in anatomy-of-an-http-transaction (#1518)

The response error handler in the code example uses `console.error()`,
so the note should mention `stderr`, not `stdout`.

Author: vsemozhetbyt

locale/en/docs/guides/anatomy-of-an-http-transaction.md

@@ -363,7 +363,7 @@ though, we'd want to inspect the error to figure out what the correct status cod
 and message would be. As usual with errors, you should consult the
 [`Error` documentation][].
 
-On the response, we'll just log the error to `stdout`.
+On the response, we'll just log the error to `stderr`.
 
 ```javascript
 const http = require('http');