[MINOR][DOC] ForeachBatch doc fix.
[MINOR][DOC] ForeachBatch doc fix.

## What changes were proposed in this pull request?

ForeachBatch doc is wrongly formatted. This PR formats it.

## How was this patch tested?

```
cd docs
SKIP_API=1 jekyll build
```
Manual webpage check.

Closes #24698 from gaborgsomogyi/foreachbatchdoc.

Authored-by: Gabor Somogyi <40e6b04f18fce378745bb3a5827ff2f7df5c5829@gmail.com>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

BryanCutler/spark,icexelloss/spark,HyukjinKwon/spark,nchammas/spark,zero323/spark,spark-test/spark,ConeyLiu/spark,HyukjinKwon/spark,ConeyLiu/spark,wzhfy/spark,vinodkc/spark,rezasafi/spark,taroplus/spark,darionyaphet/spark,WeichenXu123/spark,ptkool/spark,zero323/spark,witgo/spark,zzcclp/spark,kiszk/spark,JoshRosen/spark,apache/spark,darionyaphet/spark,ConeyLiu/spark,bdrillard/spark,caneGuy/spark,mahak/spark,witgo/spark,kiszk/spark,dongjoon-hyun/spark,jiangxb1987/spark,milliman/spark,ueshin/apache-spark,taroplus/spark,LantaoJin/spark,rezasafi/spark,WeichenXu123/spark,HyukjinKwon/spark,ConeyLiu/spark,jiangxb1987/spark,jiangxb1987/spark,zuotingbing/spark,LantaoJin/spark,witgo/spark,jkbradley/spark,goldmedal/spark,bdrillard/spark,cloud-fan/spark,mahak/spark,wangmiao1981/spark,pgandhi999/spark,bdrillard/spark,techaddict/spark,jkbradley/spark,srowen/spark,caneGuy/spark,techaddict/spark,jiangxb1987/spark,shuangshuangwang/spark,goldmedal/spark,caneGuy/spark,caneGuy/spark,holdenk/spark,zuotingbing/spark,maropu/spark,shuangshuangwang/spark,actuaryzhang/spark,icexelloss/spark,nchammas/spark,WeichenXu123/spark,caneGuy/spark,ConeyLiu/spark,dbtsai/spark,darionyaphet/spark,JoshRosen/spark,wzhfy/spark,mahak/spark,LantaoJin/spark,maropu/spark,shaneknapp/spark,vinodkc/spark,wzhfy/spark,spark-test/spark,dbtsai/spark,skonto/spark,wangyum/spark,techaddict/spark,vinodkc/spark,wangmiao1981/spark,rezasafi/spark,dbtsai/spark,actuaryzhang/spark,ueshin/apache-spark,rezasafi/spark,kevinyu98/spark,HyukjinKwon/spark,taroplus/spark,darionyaphet/spark,witgo/spark,HyukjinKwon/spark,jiangxb1987/spark,jiangxb1987/spark,jkbradley/spark,goldmedal/spark,icexelloss/spark,shuangshuangwang/spark,jkbradley/spark,bdrillard/spark,rezasafi/spark,xuanyuanking/spark,zero323/spark,srowen/spark,zuotingbing/spark,mahak/spark,jiangxb1987/spark,BryanCutler/spark,rezasafi/spark,xuanyuanking/spark,holdenk/spark,cloud-fan/spark,zuotingbing/spark,ptkool/spark,wangmiao1981/spark,vinodkc/spark,zzcclp/spark,ueshin/apache-spark,chuckchen/spark,milliman/spark,aosagie/spark,chuckchen/spark,BryanCutler/spark,ueshin/apache-spark,LantaoJin/spark,goldmedal/spark,ptkool/spark,actuaryzhang/spark,apache/spark,JoshRosen/spark,pgandhi999/spark,techaddict/spark,ConeyLiu/spark,icexelloss/spark,vinodkc/spark,aosagie/spark,dongjoon-hyun/spark,rednaxelafx/apache-spark,goldmedal/spark,hvanhovell/spark,wangyum/spark,holdenk/spark,skonto/spark,holdenk/spark,shaneknapp/spark,ptkool/spark,rednaxelafx/apache-spark,gengliangwang/spark,maropu/spark,nchammas/spark,apache/spark,goldmedal/spark,cloud-fan/spark,dbtsai/spark,ueshin/apache-spark,xuanyuanking/spark,maropu/spark,rezasafi/spark,rednaxelafx/apache-spark,jkbradley/spark,wangyum/spark,shaneknapp/spark,dongjoon-hyun/spark,holdenk/spark,chuckchen/spark,xuanyuanking/spark,wzhfy/spark,JoshRosen/spark,vinodkc/spark,taroplus/spark,milliman/spark,srowen/spark,bdrillard/spark,aosagie/spark,nchammas/spark,mahak/spark,pgandhi999/spark,rednaxelafx/apache-spark,BryanCutler/spark,wangmiao1981/spark,dbtsai/spark,rednaxelafx/apache-spark,BryanCutler/spark,kevinyu98/spark,shuangshuangwang/spark,BryanCutler/spark,cloud-fan/spark,caneGuy/spark,icexelloss/spark,skonto/spark,ptkool/spark,mahak/spark,dongjoon-hyun/spark,zzcclp/spark,maropu/spark,witgo/spark,wangyum/spark,wangyum/spark,wzhfy/spark,xuanyuanking/spark,aosagie/spark,maropu/spark,wzhfy/spark,caneGuy/spark,pgandhi999/spark,kevinyu98/spark,apache/spark,chuckchen/spark,aosagie/spark,wzhfy/spark,gengliangwang/spark,zuotingbing/spark,shaneknapp/spark,WeichenXu123/spark,bdrillard/spark,milliman/spark,gengliangwang/spark,ueshin/apache-spark,kiszk/spark,apache/spark,shuangshuangwang/spark,gengliangwang/spark,darionyaphet/spark,actuaryzhang/spark,LantaoJin/spark,wangmiao1981/spark,kevinyu98/spark,skonto/spark,nchammas/spark,icexelloss/spark,kiszk/spark,cloud-fan/spark,kevinyu98/spark,pgandhi999/spark,shuangshuangwang/spark,spark-test/spark,spark-test/spark,actuaryzhang/spark,zuotingbing/spark,milliman/spark,gengliangwang/spark,darionyaphet/spark,JoshRosen/spark,ptkool/spark,dbtsai/spark,actuaryzhang/spark,JoshRosen/spark,chuckchen/spark,wangyum/spark,BryanCutler/spark,cloud-fan/spark,kevinyu98/spark,shuangshuangwang/spark,milliman/spark,witgo/spark,witgo/spark,zzcclp/spark,srowen/spark,zero323/spark,zero323/spark,jkbradley/spark,apache/spark,zero323/spark,skonto/spark,techaddict/spark,cloud-fan/spark,wangmiao1981/spark,rednaxelafx/apache-spark,hvanhovell/spark,zero323/spark,dongjoon-hyun/spark,holdenk/spark,darionyaphet/spark,WeichenXu123/spark,nchammas/spark,shaneknapp/spark,zuotingbing/spark,kevinyu98/spark,nchammas/spark,bdrillard/spark,chuckchen/spark,srowen/spark,ueshin/apache-spark,LantaoJin/spark,taroplus/spark,icexelloss/spark,techaddict/spark,srowen/spark,hvanhovell/spark,xuanyuanking/spark,gengliangwang/spark,dbtsai/spark,zzcclp/spark,pgandhi999/spark,HyukjinKwon/spark,hvanhovell/spark,hvanhovell/spark,jkbradley/spark,matthewfranglen/spark,mahak/spark,kiszk/spark,xuanyuanking/spark,LantaoJin/spark,JoshRosen/spark,zzcclp/spark,wangyum/spark,kiszk/spark,maropu/spark,shaneknapp/spark,rednaxelafx/apache-spark,wangmiao1981/spark,HyukjinKwon/spark,spark-test/spark,spark-test/spark,taroplus/spark,holdenk/spark,kiszk/spark,hvanhovell/spark,ptkool/spark,taroplus/spark,apache/spark,skonto/spark,goldmedal/spark,dongjoon-hyun/spark,srowen/spark,spark-test/spark,WeichenXu123/spark,aosagie/spark,shaneknapp/spark,chuckchen/spark,gengliangwang/spark,zzcclp/spark,dongjoon-hyun/spark,pgandhi999/spark,vinodkc/spark,actuaryzhang/spark,WeichenXu123/spark,milliman/spark,ConeyLiu/spark,techaddict/spark,aosagie/spark,hvanhovell/spark,skonto/spark