docs: config: add logging section

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Migrated from D4598 (view on Phabricator)

mentioned in issue #2811 (closed)

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Patch application report for D4598 (id=16335)

Rebasing onto 7c694bdc...

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commit c73312c854098a02de51654fed98acd7cca32b7c
Author: Thibault Allançon <haltode@gmail.com>
Date:   Thu Nov 26 11:22:03 2020 +0100

    docs: config: add logging section

See https://jenkins.softwareheritage.org/job/DFUSE/job/tests-on-diff/191/ for more details.

Merge request was merged

closed