Fix collection of typos and grammar mistakes in the tree, volume 2

Michael Paquier <michael@paquier.xyz>

Commit: 8128b0c152a67917535f50738ac26da4f984ddd9
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-04-14T05:45:43Z
Releases: 13.0
Fix collection of typos and grammar mistakes in the tree, volume 2

This fixes some comments and documentation new as of Postgres 13, and is
a follow-up of the work done in dd0f37e.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20200408165653.GF2228@telsasoft.com

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