Update more comments for 96198d94cb7adc664bda341842dc8db671d8be72.

Robert Haas <rhaas@postgresql.org>

Commit: 6be84eeb8d5a72014b1b6e44d0646f69531a1ccf
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-03-14T18:29:12Z
Releases: 9.6.0
Update more comments for 96198d94cb7adc664bda341842dc8db671d8be72.

Etsuro Fujita, reviewed (though not completely endorsed) by Ashutosh
Bapat, and slightly expanded by me.

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