[SPARK-33354][FOLLOWUP][DOC] Shorten the table width of ANSI compliance casting document
[SPARK-33354][FOLLOWUP][DOC] Shorten the table width of ANSI compliance casting document

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

This is a follow-up of https://github.com/apache/spark/pull/30260
It shortens the table width of ANSI compliance casting document.

### Why are the changes needed?

The table is too wide and the UI of doc site is broken if we scroll the page to right side.
![Screen Shot 2021-01-14 at 3 04 57 PM](https://user-images.githubusercontent.com/1097932/104565897-d2693b80-5601-11eb-9f93-5f603cfc94c1.png)

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

Minor document change

### How was this patch tested?

Build doc site locally and preview:
![Screen Shot 2021-01-14 at 4 44 30 PM](https://user-images.githubusercontent.com/1097932/104565814-b2d21300-5601-11eb-94c4-78c785cda8ed.png)

Closes #31180 from gengliangwang/reviseAnsiDocStyle.

Authored-by: Gengliang Wang <bfe1a7b36425bd89859a70a36586361d28ec35eb@databricks.com>
Signed-off-by: Dongjoon Hyun <9b02cb7e37158797a8e22c559f7c5f5ecd28ea57@apple.com>

jiangxb1987/spark,shaneknapp/spark,nchammas/spark,zero323/spark,HyukjinKwon/spark,holdenk/spark,mahak/spark,jiangxb1987/spark,ueshin/apache-spark,xuanyuanking/spark,zzcclp/spark,apache/spark,ueshin/apache-spark,mahak/spark,witgo/spark,gengliangwang/spark,BryanCutler/spark,jiangxb1987/spark,HyukjinKwon/spark,xuanyuanking/spark,taroplus/spark,JoshRosen/spark,zero323/spark,taroplus/spark,chuckchen/spark,chuckchen/spark,JoshRosen/spark,holdenk/spark,apache/spark,milliman/spark,WeichenXu123/spark,BryanCutler/spark,chuckchen/spark,holdenk/spark,zzcclp/spark,vinodkc/spark,mahak/spark,BryanCutler/spark,nchammas/spark,taroplus/spark,rednaxelafx/apache-spark,nchammas/spark,maropu/spark,jiangxb1987/spark,mahak/spark,ueshin/apache-spark,xuanyuanking/spark,zzcclp/spark,apache/spark,BryanCutler/spark,JoshRosen/spark,HyukjinKwon/spark,zzcclp/spark,zero323/spark,WeichenXu123/spark,BryanCutler/spark,cloud-fan/spark,vinodkc/spark,dongjoon-hyun/spark,zzcclp/spark,srowen/spark,nchammas/spark,dongjoon-hyun/spark,witgo/spark,xuanyuanking/spark,hvanhovell/spark,witgo/spark,zzcclp/spark,mahak/spark,wangyum/spark,milliman/spark,apache/spark,dongjoon-hyun/spark,rednaxelafx/apache-spark,shaneknapp/spark,taroplus/spark,chuckchen/spark,jiangxb1987/spark,cloud-fan/spark,holdenk/spark,witgo/spark,zero323/spark,gengliangwang/spark,rednaxelafx/apache-spark,dongjoon-hyun/spark,JoshRosen/spark,gengliangwang/spark,WeichenXu123/spark,nchammas/spark,zero323/spark,WeichenXu123/spark,WeichenXu123/spark,cloud-fan/spark,witgo/spark,srowen/spark,xuanyuanking/spark,maropu/spark,maropu/spark,maropu/spark,srowen/spark,ueshin/apache-spark,vinodkc/spark,rednaxelafx/apache-spark,wangmiao1981/spark,apache/spark,cloud-fan/spark,zero323/spark,hvanhovell/spark,BryanCutler/spark,dongjoon-hyun/spark,rednaxelafx/apache-spark,zero323/spark,taroplus/spark,JoshRosen/spark,apache/spark,shaneknapp/spark,ueshin/apache-spark,hvanhovell/spark,HyukjinKwon/spark,zzcclp/spark,jiangxb1987/spark,wangmiao1981/spark,cloud-fan/spark,WeichenXu123/spark,shaneknapp/spark,nchammas/spark,ueshin/apache-spark,HyukjinKwon/spark,wangmiao1981/spark,chuckchen/spark,xuanyuanking/spark,srowen/spark,hvanhovell/spark,srowen/spark,JoshRosen/spark,holdenk/spark,shaneknapp/spark,maropu/spark,shaneknapp/spark,shaneknapp/spark,vinodkc/spark,HyukjinKwon/spark,JoshRosen/spark,cloud-fan/spark,cloud-fan/spark,WeichenXu123/spark,maropu/spark,hvanhovell/spark,holdenk/spark,hvanhovell/spark,milliman/spark,rednaxelafx/apache-spark,wangyum/spark,BryanCutler/spark,nchammas/spark,gengliangwang/spark,dongjoon-hyun/spark,vinodkc/spark,srowen/spark,wangyum/spark,HyukjinKwon/spark,taroplus/spark,srowen/spark,milliman/spark,wangmiao1981/spark,wangmiao1981/spark,hvanhovell/spark,wangyum/spark,milliman/spark,ueshin/apache-spark,gengliangwang/spark,chuckchen/spark,witgo/spark,wangyum/spark,mahak/spark,maropu/spark,holdenk/spark,wangyum/spark,gengliangwang/spark,apache/spark,rednaxelafx/apache-spark,jiangxb1987/spark,vinodkc/spark,wangmiao1981/spark,xuanyuanking/spark,mahak/spark,dongjoon-hyun/spark,wangyum/spark,gengliangwang/spark,chuckchen/spark,vinodkc/spark,taroplus/spark,milliman/spark,milliman/spark,wangmiao1981/spark,witgo/spark