doc: remove warning against readable/readable.read

Remove suggestion to avoid `readable` event and `readabe.read()` method.
No explanation was provided for this suggestion.

Backport-PR-URL: #22380
PR-URL: #19193
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Chen Gang <gangc.cxy@foxmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

doc/api/stream.md

@@ -934,9 +934,6 @@ readable.on('readable', () => {
 });
 ```
 
-Avoid the use of the `'readable'` event and the `readable.read()` method in
-favor of using either `readable.pipe()` or the `'data'` event.
-
 A Readable stream in object mode will always return a single item from
 a call to [`readable.read(size)`][stream-read], regardless of the value of the
 `size` argument.