vmstat: update page (#3927)

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Ein Verne 2020-03-25 01:30:44 +08:00 committed by GitHub
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@ -3,6 +3,10 @@
> Report information about processes, memory, paging, block IO, traps, disks and CPU activity.
> More information: <https://linux.die.net/man/8/vmstat>.
- Display virtual memory statistics:
`vmstat`
- Display reports every 2 seconds for 5 times:
`vmstat {{2}} {{5}}`