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doc: Update iostat.md (#498) 

iostat的util参数解读有误。参照于man手册
Percentage of elapsed time during which I/O requests were issued to the device (bandwidth utilization for the device). Device saturation occurs when this value is close to 100% for  devices  serving  requests  serially.But  for  devices serving requests in parallel, such as RAID arrays and modern SSDs, this number does not reflect their performance limits.
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@ -69,6 +69,6 @@ avgrq-sz | 需求的平均大小区段
avgqu-sz | 需求的平均队列长度
await | 等待I/O平均的时间（milliseconds）
svctm | I/O需求完成的平均时间
%util | 被I/O需求消耗的CPU百分比
%util | 设备带宽的使用率，达到100%表示饱和，达到性能瓶颈，如果是支持处理并发请求的设备则不代表性能瓶颈。