[SPARK-35951][DOCS] Add since versions for Avro options in Documentation
[SPARK-35951][DOCS] Add since versions for Avro options in Documentation

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

There are two new Avro options `datetimeRebaseMode` and `positionalFieldMatching` after Spark 3.2.
We should document the since version so that users can know whether the option works in their Spark version.

### Why are the changes needed?

Better documentation.

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

No
### How was this patch tested?

Manual preview on local setup.
<img width="828" alt="Screen Shot 2021-06-30 at 5 05 54 PM" src="https://user-images.githubusercontent.com/1097932/123934000-ba833b00-d947-11eb-9ca5-ce8ff8add74b.png">

<img width="711" alt="Screen Shot 2021-06-30 at 5 06 34 PM" src="https://user-images.githubusercontent.com/1097932/123934126-d4bd1900-d947-11eb-8d80-69df8f3d9900.png">

Closes #33153 from gengliangwang/version.

Authored-by: Gengliang Wang <789196f1837e809005c9b5b207ae21d5a78ca970@apache.org>
Signed-off-by: Gengliang Wang <789196f1837e809005c9b5b207ae21d5a78ca970@apache.org>

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