Revert use singular for -1 (commits 9ee7d533da and 5da9868ed9

Bruce Momjian <bruce@momjian.us>

Commit: 651d005e76bc0b9542615f609b4d0d946035dc58
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-01T14:42:44Z
Releases: 14.0
Revert use singular for -1 (commits 9ee7d533da and 5da9868ed9

Turns out you can specify negative values using plurals:

	https://english.stackexchange.com/questions/9735/is-1-followed-by-a-singular-or-plural-noun

so the previous code was correct enough, and consistent with other usage
in our code.  Also add comment in the two places where this could be
confused.

Reported-by: Noah Misch

Diagnosed-by: 20210425115726.GA2353095@rfd.leadboat.com

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