Fix typos.

Amit Kapila <akapila@postgresql.org>

Commit: 9679345f3c5ec071f63db358581e28f06c8744a7
Author: Amit Kapila <akapila@postgresql.org>
Date: 2019-05-26T12:58:18Z
Releases: 12.0
Fix typos.

Reported-by: Alexander Lakhin
Author: Alexander Lakhin
Reviewed-by: Amit Kapila and Tom Lane
Discussion: https://postgr.es/m/7208de98-add8-8537-91c0-f8b089e2928c@gmail.com

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