doc: warn against streaming from character devices

charcter device streaming works just like any other streams, but hangs
on the close callsite due to the worker thread being blocked on the read
and main thread waiting for any async event that may not occur.

Document this behavior and suggest a potential workaround.

Fixes: https://github.com/nodejs/node/issues/15439
PR-URL: https://github.com/nodejs/node/pull/21212



Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>