Doc: Improve wording of multiple places in documentation

Michael Paquier <michael@paquier.xyz>

Commit: b298e37013683f896b0a224eee50937730faeca8
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-08-20T03:37:30Z
Releases: 12.0
Doc: Improve wording of multiple places in documentation

This has been found during its translation.

Author: Liudmila Mantrova
Discussion: https://postgr.es/m/CAEkD-mDJHV3bhgezu3MUafJLoAKsOOT86+wHukKU8_NeiJYhLQ@mail.gmail.com
Backpatch-through: 12

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