Please make a note regarding the PL/pgSQL FOUND variable

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/16/sql-createtableas.html
Description:

Since I was recently bitten by the fact that CREATE TABLE AS doesn't set the
PL/pgSQL variable FOUND, it would be nice if that were explicitly noted in
the documentation.  Alternatively, if it COULD set the FOUND variable, that
would be great, although I realize the difficulty of that when coupled with
IF NOT EXISTS.