Update benchmark-tidb-using-sysbench.md

[pepezzzz]

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

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[REVIEW NOTIFICATION]

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[jackysp]

LGTM

[jackysp]

PTAL @TomShawn

[TomShawn]

LGTM

[TomShawn]

/merge

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

Commit hash: d5f58a8

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #12608.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12609.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12610.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12611.