Fix typo

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

Commit: 8f75e8e44609335e6bdd73123284682235f242a2
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-08-21T15:12:44Z
Releases: 13.0
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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