move dm architecture in toc

[ran-huang]

Signed-off-by: Ran huangran.alex@gmail.com

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• This PR is translated from:dm: move up dm arch doc docs-cn#10065
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[REVIEW NOTIFICATION]

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• shichun-0415

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[shichun-0415]

LGTM

[ran-huang]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 3dadea5

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #9500.