api/extid: Update documentation to mention some extid version bumps

Versions of extids related to nix/guix were bumped to 1 as some issues were detected in production after the first batch of related loadings.

Related to swh/infra/sysadm-environment#5222 (closed).

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• 42a73204 - api/extid: Update documentation to mention some extid version bumps

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