Comments and doc fixes for commit 40d964ec99.

Amit Kapila <akapila@postgresql.org>

Commit: a6fea120a7e3858e642bb5e96027f166a1a6f134
Author: Amit Kapila <akapila@postgresql.org>
Date: 2020-04-14T02:40:27Z
Releases: 13.0
Comments and doc fixes for commit 40d964ec99.

Reported-by: Justin Pryzby
Author: Justin Pryzby, with few changes by me
Reviewed-by: Amit Kapila and Sawada Masahiko
Discussion: https://postgr.es/m/20200322021801.GB2563@telsasoft.com

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