Fix typo

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: d60ec8fe529850d10c3422086912056c5af4e61c
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-08-21T15:12:44Z
Releases: 12.0
Fix typo

In early development patches, "replication origins" were called "identifiers";
almost everything was renamed, but these references to the old terminology
went unnoticed.

Reported-by: Craig Ringer

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