In unquoted identifiers, only single-byte characters are always folded to lower case

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/11/sql-syntax-lexical.html
Description:

Last paragraph on "4.1.1. Identifiers and Key Words" in the documentation
states:
1.- "[...] unquoted names are always folded to lower case"
2.- "If you want to write portable applications you are advised to always
quote a particular name or never quote it"

As said in response to bug #15516 (Identifier not quoted with uppercase
letter (spanish Ñ) doesn't get transformed to lowercase (ñ)) on
pgsql-bugs:
"PG's downcasing transform is only applied to single-byte characters.
So Ñ could be transformed in LATIN1 encoding, but not UTF8."

Given that, that paragraph should clarify this situation by:
1.- replacing "always folded to lower case" with "always folded to lower
case, except for multi-byte characters".
2.- adding another example about this. For instance, "But identifier AÑO
(using multi-byte character Ñ, Unicode U+00D1) is folded to aÑo."
3.- removing "or never quote it".

Regards,
Paco Calvo.