doc: Fix some typos and grammar

Michael Paquier <michael@paquier.xyz>

Commit: cccfa08c39e194e7737d444974173e47a87b62c8
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-10-25T00:40:55Z
Releases: 17.0
doc: Fix some typos and grammar

Author: Ekaterina Kiryanova, Elena Indrupskaya, Oleg Sibiryakov, Maxim
Yablokov
Discussion: https://postgr.es/m/7aad518b-3e6d-47f3-9184-b1d69cb412e7@postgrespro.ru
Backpatch-through: 11

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