Fix double-word typos

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

Commit: b9768458154de6c001af23efc02514f120c6094f
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-06-13T14:03:56Z
Releases: 12.0
Fix double-word typos

Discussion: https://postgr.es/m/20190612184527.GA24266@alvherre.pgsql
Reviewed-by: Michaël Paquier

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