doc: added ready events to fs/streams,net/socket

PR-URL: https://github.com/nodejs/node/pull/19968
Fixes: https://github.com/nodejs/node/issues/19796


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>