doc: Fix some typos and grammar

Michael Paquier <michael@paquier.xyz>

Commit: 644b848f50ef75430c0134654f86e8234691e390
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-04-12T04:03:09Z
Releases: 16.0
doc: Fix some typos and grammar

This is a first batch of the fixes, for the most obvious fixes.  A
little bit more is under discussion.

Author: Thom Brown, Justin Pryzby
Discussion: https://postgr.es/m/CAA-aLv7xCZ0nBJa-NWe0rxBB28TjFjS2JtjiZMoQ+0wsugG+hQ@mail.gmail.com

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