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doc: Clarify when backend_xmin in pg_stat_replication can be NULL.

Fujii Masao <fujii@postgresql.org>

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Commit: e64aa1a39d4b8a9502be8ed8dfd67efd6f6acf28
Author: Fujii Masao <fujii@postgresql.org>
Date: 2025-10-17T05:03:42Z
Releases: 19 (unreleased) 
doc: Clarify when backend_xmin in pg_stat_replication can be NULL.

Improve the documentation of pg_stat_replication to explain when
the backend_xmin column becomes NULL. This happens when
a replication slot is used (the xmin is then shown in pg_replication_slots)
or when hot_standby_feedback is disabled.

Author: Renzo Dani <arons7@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CA+XOKQAMXzskpdUmj2sg03_5fmiXc2Gs0r3TX1_rmcFcqh+=xQ@mail.gmail.com

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