pgsql: Update obsolete comment that still referred to CheckpointLock

Update obsolete comment that still referred to CheckpointLock CheckpointLock was removed in commit d18e75664a, and commit ce197e91d0 updated a leftover comment in CreateCheckPoint, but there was another copy of it in CreateRestartPoint still. Branch -- master Details --- https://git.post

pgsql: Update obsolete comment that still referred to CheckpointLock

Update obsolete comment that still referred to CheckpointLock CheckpointLock was removed in commit d18e75664a, and commit ce197e91d0 updated a leftover comment in CreateCheckPoint, but there was another copy of it in CreateRestartPoint still. Branch -- REL_14_STABLE Details --- https://g