doc: correct description of libpq's PQsetnonblocking() mode

Bruce Momjian <bruce@momjian.us>

Commit: 4b48770aeb6dd83df09e1a73dc111850ba19762c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-11-13T19:03:37Z
Releases: 16.2
doc:  correct description of libpq's PQsetnonblocking() mode

Reported-by: Yugo NAGATA

Discussion: https://postgr.es/m/20210713115949.702986955f8ccf23fa81073c@sraoss.co.jp

Backpatch-through: 12-16, master already done

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doc/src/sgml/libpq.sgml modified +4 −3

Documentation touched