docs: Update for the new API + remove references to deprecated module swh.model.identifiers

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Migrated from D6429 (view on Phabricator)

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Patch application report for D6429 (id=23357)

Rebasing onto 6fd1f523...

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commit bd9862af5165bd12af87f10cd10cb3197a225478
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Thu Oct 7 10:30:05 2021 +0200

    docs: Update for the new API + remove references to deprecated module swh.model.identifiers

See https://jenkins.softwareheritage.org/job/DVAU/job/tests-on-diff/184/ for more details.

Looks good to me.

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