Make multixact error message more explicit

There are recent reports involving a very old error message that we have
no history of hitting -- perhaps a recently introduced bug.  Improve the
error message in an attempt to improve our chances of investigating the
bug.

Per reports from Dimos Stamatakis and Bob Krier.

Backpatch to 11.

Discussion: 
https://postgr.es/m/co2pr0801mb2310579f65529380a4e5edc0e2...@co2pr0801mb2310.namprd08.prod.outlook.com
Discussion: https://postgr.es/m/17518-04e368df5ad7f...@postgresql.org

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/f63f29733e2f4fe58f52557699242b80e23e19ee

Modified Files
--------------
src/backend/access/transam/multixact.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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