doc: document fs.write limitation with TTY

Fixes: https://github.com/nodejs/node/issues/24550

PR-URL: https://github.com/nodejs/node/pull/24571


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>