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[SPARK-21924][Docs] Update structured streaming programming guide doc #19137

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[SPARK-21924][Docs] Update structured streaming programming guide doc #19137

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2 changes: 1 addition & 1 deletion docs/structured-streaming-programming-guide.md
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Expand Up @@ -977,7 +977,7 @@ at the beginning of every trigger is the red line For example, when the engine
`(12:14, dog)`, it sets the watermark for the next trigger as `12:04`.
This watermark lets the engine maintain intermediate state for additional 10 minutes to allow late
data to be counted. For example, the data `(12:09, cat)` is out of order and late, and it falls in
windows `12:05 - 12:15` and `12:10 - 12:20`. Since, it is still ahead of the watermark `12:04` in
windows `12:00 - 12:10` and `12:05 - 12:15`. Since, it is still ahead of the watermark `12:04` in
the trigger, the engine still maintains the intermediate counts as state and correctly updates the
counts of the related windows. However, when the watermark is updated to `12:11`, the intermediate
state for window `(12:00 - 12:10)` is cleared, and all subsequent data (e.g. `(12:04, donkey)`)
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