Doc: Improve wording of multiple places in documentation

Michael Paquier <michael@paquier.xyz>

Commit: 0431a787469265776eeb9a472beb3457d2990edb
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-08-20T03:36:31Z
Releases: 13.0
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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