Fix typos and grammar in comments and docs

Michael Paquier <michael@paquier.xyz>

Commit: 7ef8b52cf079ef3ace4575f7b97c2d6f80463b4f
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-04-19T02:32:30Z
Releases: 14.0
Fix typos and grammar in comments and docs

Author: Justin Pryzby
Discussion: https://postgr.es/m/20210416070310.GG3315@telsasoft.com

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Documentation touched

Discussion