doc: Add description for PGSSLCRLDIR

Michael Paquier <michael@paquier.xyz>

Commit: 1e809db86b160e697a56bf47358f7733475840d3
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-06-04T00:46:15Z
Releases: 14.0
doc: Add description for PGSSLCRLDIR

This was missing in the section dedicated to the supported environment
variables of libpq.  Oversight in f5465fa.

Reviewed-by: Daniel Gustafsson, Kyotaro Horiguchi
Discussion: https://postgr.es/m/YLhI0mLoRkY3u4Wj@paquier.xyz

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doc/src/sgml/libpq.sgml modified +10 −0

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