Remove the operate-source update command

[Oreoxmt]

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Close #11439

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[buchuitoudegou]

I think it affects dm doc that is prior to 5.4 too

FYI:
https://docs.pingcap.com/tidb-data-migration/v5.3/dm-manage-source

[Oreoxmt]

/status LGT1

[Oreoxmt]

/merge

[ti-chi-bot]

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

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Commit hash: 929d13c

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11444.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11445.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11446.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11447.