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fix typo in runmetrics.md

fix typo

Signed-off-by: mqliang <mqliang.zju@gmail.com>
Liang Mingqiang 9 years ago
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      docs/articles/runmetrics.md

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docs/articles/runmetrics.md

@@ -283,7 +283,7 @@ relevant ones:
    otherwise quiescent device, which is therefore able to handle them
    immediately, without queuing. Also, while it is helpful to figure
    out which cgroup is putting stress on the I/O subsystem, keep in
-   mind that is is a relative quantity. Even if a process group does
+   mind that it is a relative quantity. Even if a process group does
    not perform more I/O, its queue size can increase just because the
    device load increases because of other devices.