Document training subcommands

Documentation about training subcommands were missing.

changed milestone to %ML Prod - February 2023 n°1

added P2 + 1 deleted label

requested review from @melodie.boillet

assigned to @schneider-y

The lint fails but should be fixed by https://gitlab.com/teklia/atr/dan/-/merge_requests/54 hopefully

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• 44be2ed5 - document training subcommands

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