doc: fix errors in sample code comments

The errors thrown have changed in a few places. Update the comments to
reflect the current errors.

The `noAssert` option has been removed but it is still shown in sample
code in a few places. Remove that sample code.

PR-URL: https://github.com/nodejs/node/pull/19963


Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>