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doc: Correct description of restart_lsn in pg_replication_slots

Fujii Masao <fujii@postgresql.org>

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Commit: 95a604eaebd145729d9f8c936b37703a212f27fd
Author: Fujii Masao <fujii@postgresql.org>
Date: 2020-07-03T03:09:07Z
Releases: 13.0 
doc: Correct description of restart_lsn in pg_replication_slots

Previously the document explained that restart_lsn indicates the LSN of
oldest WAL won't be automatically removed during checkpoints. But
since v13 this was no longer true thanks to max_slot_wal_keep_size.

Back-patch to v13 where max_slot_wal_keep_size was added.

Author: Fujii Masao
Discussion: https://postgr.es/m/6497f1e9-3148-c5da-7e49-b2fddad9a42f@oss.nttdata.com

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