[SPARK-30464][PYTHON][DOCS] Explicitly note that we don't add "pandas compatible" aliases
[SPARK-30464][PYTHON][DOCS] Explicitly note that we don't add "pandas compatible" aliases

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

This PR adds a note that we're not adding "pandas compatible" aliases anymore.

### Why are the changes needed?

We added "pandas compatible" aliases as of https://github.com/apache/spark/pull/5544 and https://github.com/apache/spark/pull/6066 . There are too many differences and I don't think it makes sense to add such aliases anymore at this moment.

I was even considering deprecating them out but decided to take a more conservative approache by just documenting it.

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

No.

### How was this patch tested?

Existing tests should cover.

Closes #27142 from HyukjinKwon/SPARK-30464.

Authored-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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