doc: error message are still major

PR-URL: nodejs#14375
Refs: nodejs#13937
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/guides/using-internal-errors.md

@@ -15,9 +15,7 @@ to be breaking changes. By providing a permanent identifier for a specific
 error, we reduce the need for userland code to inspect error messages.
 
 *Note*: Switching an existing error to use the `internal/errors` module must be
-considered a `semver-major` change. However, once using `internal/errors`,
-changes to `internal/errors` error messages will be handled as `semver-minor`
-or `semver-patch`.
+considered a `semver-major` change.
 
 ## Using internal/errors.js