doc: clarify `requireManualDestroy` option

Fixes: https://github.com/nodejs/node/issues/32409

PR-URL: https://github.com/nodejs/node/pull/32514


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>