[7.13] [DOCS] Clarifies behavior of datafeeds with or without an end time (#1754)#1757

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szabosteve merged 1 commit intoelastic:7.13from szabosteve:backport/7.13/pr-1754

Jul 13, 2021

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Commits on Jul 13, 2021

[DOCS] Clarifies behavior of datafeeds with or without an end time (elastic#1754 )
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