docs: index: update shell examples with recent CLI changes

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Migrated from D4761 (view on Phabricator)

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Rebasing onto b2df1673...

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commit 2477fd09c0a816350de9c09cc20c7d5b9a67b633
Author: Thibault Allançon <haltode@gmail.com>
Date:   Thu Dec 17 15:13:37 2020 +0100

    docs: index: update shell examples with recent CLI changes

See https://jenkins.softwareheritage.org/job/DWCLI/job/tests-on-diff/37/ for more details.

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