[MINOR][SS]Remove duplicate 'add' in comment of `StructuredSessionization`.#24589

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beliefer wants to merge 3 commits intoapache:masterfrom

beliefer:remove-duplicate-add-in-comment

Commits on May 13, 2019

remove duplicate add in comment.
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Commits on May 14, 2019

modify timestamps to time stamps
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Commits on May 15, 2019

Update StructuredSessionization.scala
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