[DOCS] change to dataset for java code in structured-streaming-kafka-integration document
[DOCS] change to dataset for java code in structured-streaming-kafka-integration document

## What changes were proposed in this pull request?

In latest structured-streaming-kafka-integration document, Java code example for Kafka integration is using `DataFrame<Row>`, shouldn't it be changed to `DataSet<Row>`?

## How was this patch tested?

manual test has been performed to test the updated example Java code in Spark 2.2.1 with Kafka 1.0

Author: brandonJY <brandonJY@users.noreply.github.com>

Closes #20312 from brandonJY/patch-2.

ueshin/apache-spark,HyukjinKwon/spark,darionyaphet/spark,maropu/spark,holdenk/spark,Aegeaner/spark,JoshRosen/spark,WindCanDie/spark,nchammas/spark,rikima/spark,szhem/spark,ddna1021/spark,hvanhovell/spark,szhem/spark,JoshRosen/spark,rezasafi/spark,wzhfy/spark,bdrillard/spark,caneGuy/spark,zuotingbing/spark,kiszk/spark,markhamstra/spark,esi-mineset/spark,ptkool/spark,wangmiao1981/spark,xuanyuanking/spark,caneGuy/spark,yanboliang/spark,debugger87/spark,icexelloss/spark,nchammas/spark,WeichenXu123/spark,lvdongr/spark,tengpeng/spark,ahnqirage/spark,ahnqirage/spark,spark-test/spark,WindCanDie/spark,lvdongr/spark,zzcclp/spark,eyalfa/spark,wangyum/spark,srowen/spark,JoshRosen/spark,pgandhi999/spark,guoxiaolongzte/spark,taroplus/spark,maropu/spark,hhbyyh/spark,facaiy/spark,sureshthalamati/spark,bdrillard/spark,ahnqirage/spark,kevinyu98/spark,eyalfa/spark,aosagie/spark,cloud-fan/spark,darionyaphet/spark,ConeyLiu/spark,ptkool/spark,aosagie/spark,goldmedal/spark,lvdongr/spark,zhouyejoe/spark,goldmedal/spark,rikima/spark,ConeyLiu/spark,kevinyu98/spark,WeichenXu123/spark,WeichenXu123/spark,JoshRosen/spark,szhem/spark,tejasapatil/spark,techaddict/spark,mahak/spark,rednaxelafx/apache-spark,jiangxb1987/spark,dbtsai/spark,yanboliang/spark,gengliangwang/spark,szhem/spark,tejasapatil/spark,maropu/spark,rikima/spark,WindCanDie/spark,facaiy/spark,mdespriee/spark,zhouyejoe/spark,facaiy/spark,jiangxb1987/spark,taroplus/spark,zuotingbing/spark,rikima/spark,spark-test/spark,tengpeng/spark,joseph-torres/spark,HyukjinKwon/spark,bdrillard/spark,hvanhovell/spark,bravo-zhang/spark,markhamstra/spark,szhem/spark,srowen/spark,kiszk/spark,taroplus/spark,sahilTakiar/spark,dongjoon-hyun/spark,actuaryzhang/spark,ptkool/spark,milliman/spark,gengliangwang/spark,kiszk/spark,zero323/spark,apache/spark,debugger87/spark,ConeyLiu/spark,srowen/spark,mahak/spark,caneGuy/spark,spark-test/spark,michalsenkyr/spark,witgo/spark,dbtsai/spark,milliman/spark,jkbradley/spark,rezasafi/spark,LantaoJin/spark,hvanhovell/spark,vinodkc/spark,kevinyu98/spark,rekhajoshm/spark,dbtsai/spark,rekhajoshm/spark,Aegeaner/spark,darionyaphet/spark,joseph-torres/spark,Aegeaner/spark,techaddict/spark,Aegeaner/spark,rikima/spark,rekhajoshm/spark,BryanCutler/spark,rednaxelafx/apache-spark,eyalfa/spark,highfei2011/spark,tejasapatil/spark,vinodkc/spark,zuotingbing/spark,esi-mineset/spark,hhbyyh/spark,ddna1021/spark,sahilTakiar/spark,ptkool/spark,brad-kaiser/spark,facaiy/spark,techaddict/spark,dongjoon-hyun/spark,lvdongr/spark,xuanyuanking/spark,chuckchen/spark,sahilTakiar/spark,guoxiaolongzte/spark,apache/spark,cloud-fan/spark,wzhfy/spark,pgandhi999/spark,kiszk/spark,ahnqirage/spark,rezasafi/spark,bravo-zhang/spark,WeichenXu123/spark,zuotingbing/spark,guoxiaolongzte/spark,debugger87/spark,nchammas/spark,cloud-fan/spark,ioana-delaney/spark,rikima/spark,JoshRosen/spark,kiszk/spark,WeichenXu123/spark,wzhfy/spark,icexelloss/spark,JoshRosen/spark,rezasafi/spark,hvanhovell/spark,actuaryzhang/spark,guoxiaolongzte/spark,chuckchen/spark,rekhajoshm/spark,michalsenkyr/spark,shuangshuangwang/spark,michalsenkyr/spark,wangyum/spark,taroplus/spark,actuaryzhang/spark,ddna1021/spark,markhamstra/spark,shaneknapp/spark,xuanyuanking/spark,jkbradley/spark,guoxiaolongzte/spark,milliman/spark,zero323/spark,ioana-delaney/spark,mdespriee/spark,rednaxelafx/apache-spark,mahak/spark,WeichenXu123/spark,tengpeng/spark,techaddict/spark,milliman/spark,BryanCutler/spark,holdenk/spark,spark-test/spark,rekhajoshm/spark,dbtsai/spark,witgo/spark,maropu/spark,guoxiaolongzte/spark,ptkool/spark,ioana-delaney/spark,sureshthalamati/spark,srowen/spark,apache/spark,szhem/spark,eyalfa/spark,HyukjinKwon/spark,brad-kaiser/spark,lvdongr/spark,rezasafi/spark,pgandhi999/spark,vinodkc/spark,WeichenXu123/spark,wangmiao1981/spark,jkbradley/spark,icexelloss/spark,holdenk/spark,ahnqirage/spark,markhamstra/spark,zzcclp/spark,brad-kaiser/spark,techaddict/spark,actuaryzhang/spark,srowen/spark,lxsmnv/spark,tengpeng/spark,zhouyejoe/spark,esi-mineset/spark,srowen/spark,mahak/spark,cloud-fan/spark,jkbradley/spark,hvanhovell/spark,zhouyejoe/spark,shuangshuangwang/spark,eyalfa/spark,wzhfy/spark,highfei2011/spark,highfei2011/spark,ueshin/apache-spark,cloud-fan/spark,shaneknapp/spark,caneGuy/spark,skonto/spark,lxsmnv/spark,HyukjinKwon/spark,dongjoon-hyun/spark,hvanhovell/spark,sureshthalamati/spark,srowen/spark,xuanyuanking/spark,esi-mineset/spark,gengliangwang/spark,jkbradley/spark,zuotingbing/spark,ConeyLiu/spark,lvdongr/spark,wangyum/spark,bravo-zhang/spark,sahilTakiar/spark,hhbyyh/spark,aosagie/spark,yanboliang/spark,goldmedal/spark,JoshRosen/spark,sureshthalamati/spark,sahilTakiar/spark,skonto/spark,lxsmnv/spark,mdespriee/spark,nchammas/spark,apache/spark,dbtsai/spark,vinodkc/spark,zero323/spark,maropu/spark,mdespriee/spark,jkbradley/spark,kevinyu98/spark,ueshin/apache-spark,yanboliang/spark,vinodkc/spark,debugger87/spark,ddna1021/spark,shaneknapp/spark,jiangxb1987/spark,brad-kaiser/spark,witgo/spark,zuotingbing/spark,brad-kaiser/spark,rikima/s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