Update benchmark-tidb-using-sysbench.md

[ran-huang]

specify the db-ps-mode and rand-type parameters explicitly.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-24 06:10:13.666002394 +0000 UTC m=+161956.260533374: ☑️ agreed by hfxsd.

[ran-huang]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.0: #14324.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #14325.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.2: #14326.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #14327.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #14328.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #14329.