doc: strengthen suggestion in errors.md

Sure, I'm advocating for permitting second-person pronouns in a current
PR, but the use in errors.md is superfluous and weakens the sentence.
Remove it.

PR-URL: https://github.com/nodejs/node/pull/34390


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>