Make error messages about WAL segment size more consistent

When Who What
2023-08-28 13:26:50 Peter Eisentraut (petere) Closed in commitfest 2023-09 with status: Committed
2023-08-28 13:26:50 Peter Eisentraut (petere) Changed committer to petere
2023-08-28 11:52:52 Aleksander Alekseev (aalekseev) New status: Ready for Committer
2023-08-28 11:52:48 Aleksander Alekseev (aalekseev) Changed reviewers to Aleksander Alekseev (a.alekseev)
2023-08-28 11:52:48 Aleksander Alekseev (aalekseev) Changed authors to Peter Eisentraut (petere)
2023-08-28 11:52:32 Aleksander Alekseev (aalekseev) Attached mail thread 9939aa8a-d7be-da2c-7715-0a0b5535a1f7@eisentraut.org
2023-08-28 11:52:32 Aleksander Alekseev (aalekseev) Created patch record