doc: Fix description of pg_replication_origin_oid() in error case

Michael Paquier <michael@paquier.xyz>

Commit: 3204b8a7affc7277ae4eebc3f53c566f859d1815
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-01-19T01:37:53Z
Releases: 13.6
doc: Fix description of pg_replication_origin_oid() in error case

This function returns NULL if the replication origin given in input
argument does not exist, contrary to what the docs described
previously.

Author: Ian Barwick
Discussion: https://postgr.es/m/CAB8KJ=htJjBL=103URqjOxV2mqb4rjphDpMeKdyKq_QXt6h05w@mail.gmail.com
Backpatch-through: 10

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