[MINOR] study

[LeeJiangchuan]

Contributor Comments

[Please place any comments here. A description of the problem/enhancement, how to reproduce the issue, your testing methodology, etc.]

I modified a misspelled word. So this pull request is a trivial rework/ code cleanup without ant test coverage

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[ottobackwards]

Hi @LeeJiangchuan, thanks for the contribution.
Can you change your pr title to start with the jira number? METRON-xxxx. If you have not opened a jira for this change, we do require it.

This is a good resource: https://cwiki.apache.org/confluence/display/METRON/Metron+Development+Environment+Setup+Instructions#MetronDevelopmentEnvironmentSetupInstructions-HowtoStartContributing