doc: Update pg_dump/dumpall/upgrade about handling of external statistics

Michael Paquier <michael@paquier.xyz>

Commit: f0a4f280b4d3cd16c368c524fe0c212643615f46
Author: Michael Paquier <michael@paquier.xyz>
Date: 2026-06-22T23:20:11Z
doc: Update pg_dump/dumpall/upgrade about handling of external statistics

The pages of pg_dump, pg_dumpall and pg_upgrade mentioned that their
--no-statistics and --statistics options did not include the handling of
statistics created by CREATE STATISTICS, which was wrong.

Oversight in c32fb29e979d.

Reported-by: Igi Izumi <igi@sraoss.co.jp>
Discussion: https://postgr.es/m/19529-c7eb1e7a0b07eae6@postgresql.org

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