doc: remove "considered" in errors.md

"would be considered a `TypeError`" -> "would be a `TypeError`".

Using "considered" introduces unnecessary ambiguity. Is is not actually
a TypeError but merely "considered" one? Why is that? We don't say.
Simplify to "is a TypeError".

PR-URL: https://github.com/nodejs/node/pull/34152


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>