doc: Fix some typos and markups

Michael Paquier <michael@paquier.xyz>

Commit: 2a27dbaeb9088718baa25bc97f2e049e063412db
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-09-29T02:56:36Z
Releases: 14.1
doc: Fix some typos and markups

Author: Ekaterina Kiryanova
Discussion: https://postgr.es/m/8a14e78f-6991-7a6e-4711-fe376635f2ad@postgrespro.ru
Backpatch-through: 14

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