tiflash: remove deprecated http_port

[Lloyd-Pottiger]

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http_port has been deprecated since v7.1.0, remove all description about it.

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[Lloyd-Pottiger]

/cc @JaySon-Huang

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[JaySon-Huang]

298 行改一下：

• tcp_port：TiFlash TCP 服务的端口，用于执行测试，默认 9000。自 tiup v1.12.5 起，如果部署的集群版本 >= v7.1.0，则该配置项不生效。

[Lloyd-Pottiger]

done

[JaySon-Huang]

LGTM

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