Fix code comments still referring to pg_start/stop_backup()

Michael Paquier <michael@paquier.xyz>

Commit: 36a8881c4bfe578e94ba97a5140d7850ffa87bed
Author: Michael Paquier <michael@paquier.xyz>
Committer: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-08-24T20:10:29Z
Releases: 15.0
Fix code comments still referring to pg_start/stop_backup()

pg_start_backup() and pg_stop_backup() have been respectively renamed to
pg_backup_start() and pg_backup_stop() as of 39969e2, but a few comments
did not get the call.

Reviewed-by: Kyotaro Horiguchi, David Steele
Discussion: https://postgr.es/m/YrqGlj1+4DF3dbZ/@paquier.xyz

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