doc: wording improvements

Bruce Momjian <bruce@momjian.us>

Commit: a978565ffcec3ea31c0827fe1dcc524163bdbdfa
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-10-27T21:23:34Z
Releases: 17.0
doc:  wording improvements

Discussion: https://postgr.es/m/a5180360-ec04-ac58-25ce-3d795d3d1f6c@postgrespro.ru

Author: Ekaterina Kiryanova

Backpatch-through: master

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