[SPARK-39219][DOC] Promote Structured Streaming over DStream
[SPARK-39219][DOC] Promote Structured Streaming over DStream

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

This PR proposes to add NOTE section for DStream guide doc to promote Structured Streaming.

Screenshot:

<img width="992" alt="screenshot-spark-streaming-programming-guide-change" src="https://user-images.githubusercontent.com/1317309/168977732-4c32db9a-0fb1-4a82-a542-bf385e5f3683.png">

### Why are the changes needed?

We see efforts of community are more focused on Structured Streaming (based on Spark SQL) than Spark Streaming (DStream). We would like to encourage end users to use Structured Streaming than Spark Streaming whenever possible for their workloads.

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

Yes, doc change.

### How was this patch tested?

N/A

Closes #36590 from HeartSaVioR/SPARK-39219.

Authored-by: Jungtaek Lim <6dfb5872701d21af1c4dd7add991df02fba61fbf@gmail.com>
Signed-off-by: Jungtaek Lim <6dfb5872701d21af1c4dd7add991df02fba61fbf@gmail.com>

shaneknapp/spark,shaneknapp/spark,WeichenXu123/spark,JoshRosen/spark,ueshin/apache-spark,shaneknapp/spark,ueshin/apache-spark,srowen/spark,zzcclp/spark,HyukjinKwon/spark,rednaxelafx/apache-spark,dongjoon-hyun/spark,gengliangwang/spark,rednaxelafx/apache-spark,vinodkc/spark,srowen/spark,WeichenXu123/spark,ueshin/apache-spark,holdenk/spark,gengliangwang/spark,ueshin/apache-spark,hvanhovell/spark,vinodkc/spark,cloud-fan/spark,mahak/spark,wangyum/spark,dongjoon-hyun/spark,vinodkc/spark,HyukjinKwon/spark,srowen/spark,cloud-fan/spark,vinodkc/spark,cloud-fan/spark,zero323/spark,dongjoon-hyun/spark,holdenk/spark,gengliangwang/spark,dongjoon-hyun/spark,HyukjinKwon/spark,zzcclp/spark,JoshRosen/spark,srowen/spark,apache/spark,holdenk/spark,mahak/spark,wangyum/spark,zero323/spark,mahak/spark,vinodkc/spark,nchammas/spark,nchammas/spark,witgo/spark,apache/spark,srowen/spark,witgo/spark,dongjoon-hyun/spark,WeichenXu123/spark,WeichenXu123/spark,apache/spark,wangyum/spark,srowen/spark,WeichenXu123/spark,cloud-fan/spark,rednaxelafx/apache-spark,zero323/spark,shaneknapp/spark,rednaxelafx/apache-spark,rednaxelafx/apache-spark,WeichenXu123/spark,mahak/spark,hvanhovell/spark,nchammas/spark,holdenk/spark,holdenk/spark,apache/spark,apache/spark,nchammas/spark,wangyum/spark,zero323/spark,JoshRosen/spark,WeichenXu123/spark,apache/spark,mahak/spark,holdenk/spark,HyukjinKwon/spark,zzcclp/spark,nchammas/spark,zzcclp/spark,zzcclp/spark,vinodkc/spark,hvanhovell/spark,zzcclp/spark,wangyum/spark,nchammas/spark,JoshRosen/spark,zzcclp/spark,gengliangwang/spark,HyukjinKwon/spark,shaneknapp/spark,shaneknapp/spark,nchammas/spark,zero323/spark,rednaxelafx/apache-spark,gengliangwang/spark,zero323/spark,cloud-fan/spark,dongjoon-hyun/spark,hvanhovell/spark,witgo/spark,JoshRosen/spark,HyukjinKwon/spark,ueshin/apache-spark,witgo/spark,holdenk/spark,witgo/spark,shaneknapp/spark,witgo/spark,zero323/spark,vinodkc/spark,witgo/spark,wangyum/spark,wangyum/spark,ueshin/apache-spark,cloud-fan/spark,JoshRosen/spark,srowen/spark,apache/spark,gengliangwang/spark,dongjoon-hyun/spark,rednaxelafx/apache-spark,HyukjinKwon/spark,cloud-fan/spark,hvanhovell/spark,mahak/spark,JoshRosen/spark,hvanhovell/spark,hvanhovell/spark,gengliangwang/spark,ueshin/apache-spark,mahak/spark