Fix typos and some format mistakes in comments

Michael Paquier <michael@paquier.xyz>

Commit: aaf8c990502f7bb28c10f6bab1d23fe2f9f0b537
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-06-12T12:05:10Z
Releases: 14.0
Fix typos and some format mistakes in comments

Author: Justin Pryzby
Discussion: https://postgr.es/m/20200612023709.GC14879@telsasoft.com

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