Fix ALTER TABLE error message

Álvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 9ea5fe5b6c80f9522d2d819592f796d40294d83e
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2025-03-04T19:07:30Z
Releases: 16.9
Fix ALTER TABLE error message

This bogus error message was introduced in 2013 by commit f177cbfe676d,
because of misunderstanding the processCASbits() API; at the time, no
test cases were added that would be affected by this change.  Only in
ca87c415e2fc was one added (along with a couple of typos), with an XXX
note that the error message was bogus.  Fix the whole, add some test
cases.

Backpatch all the way back.

Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/202503041822.aobpqke3igvb@alvherre.pgsql

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