user-manual: Add metadata-only section

Related to #2886 (closed)

Test Plan

tox

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Migrated from D4746 (view on Phabricator)

Some references in the commit message have been migrated:

• T2886 is now #2886 (closed)

Build is green

Patch application report for D4746 (id=16805)

Rebasing onto ef2bc2ec...

Current branch diff-target is up to date.

Changes applied before test

commit c660d81dbb1fae8b60bdea7b1e59ea5527448381
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Tue Dec 15 17:07:34 2020 +0100

    user-manual: Add metadata-only section
    
    Related to #2886

See https://jenkins.softwareheritage.org/job/DDEP/job/tests-on-diff/489/ for more details.

mentioned in issue #2886 (closed)

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closed