Fix typos in various places

Michael Paquier <michael@paquier.xyz>

Commit: 1fb6f62a84041b668fd9e85a2f33bb3a0fd28fdc
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-06-03T04:44:03Z
Releases: 12.0
Fix typos in various places

Author: Andrea Gelmini
Reviewed-by: Michael Paquier, Justin Pryzby
Discussion: https://postgr.es/m/20190528181718.GA39034@glet

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