update plan replayer doc

[rebelice]

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

LGTM

[TomShawn]

/merge

[ti-chi-bot]

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

Commit hash: 8b9c8ad

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #7665.