Jungtaek Lim 0eb31a06d6 [SPARK-36172][SS] Document session window into Structured Streaming guide doc ...

### What changes were proposed in this pull request?

This PR documents a new feature "native support of session window" into Structured Streaming guide doc.

Screenshots are following:

![스크린샷 2021-07-20 오후 5 04 20](https://user-images.githubusercontent.com/1317309/126284848-526ec056-1028-4a70-a1f4-ae275d4b5437.png)

![스크린샷 2021-07-20 오후 3 34 38](https://user-images.githubusercontent.com/1317309/126276763-763cf841-aef7-412a-aa03-d93273f0c850.png)

### Why are the changes needed?

This change is needed to explain a new feature to the end users.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Documentation changes.

Closes #33433 from HeartSaVioR/SPARK-36172.

Authored-by: Jungtaek Lim <kabhwan.opensource@gmail.com>
Signed-off-by: Jungtaek Lim <kabhwan.opensource@gmail.com>

2021-07-21 10:45:31 +09:00

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