doc: List all the possible values of pg_stat_wal_receiver.status

Michael Paquier <michael@paquier.xyz>

Commit: 1a1e733b623108ebba8a6e6f55235782edb8f4bb
Author: Michael Paquier <michael@paquier.xyz>
Date: 2026-01-22T08:03:21Z
doc: List all the possible values of pg_stat_wal_receiver.status

The possible values of pg_stat_wal_receiver.status have never been
documented.  Note that the status "stopped" will never show up in this
view, hence there is no need to document it.

Issue noticed while discussing a patch that aims to add a new status to
WAL receiver.

Author: Xuneng Zhou <xunengzhou@gmail.com>
Discussion: https://postgr.es/m/CABPTF7X_Jgmyk1FBVNf3tyAOKqU55LLpLMzWkGtEAb_jQWVN=g@mail.gmail.com

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