[MINOR][PYTHON][DOC] Setting toggle-prompt button in docs to user-select:none
[MINOR][PYTHON][DOC] Setting toggle-prompt button in docs to user-select:none

### What changes were proposed in this pull request?
Added a css tag for the button that toggles the python '>>>' interpreter prefix on and off.
This tag is called 'user-select' and was set to 'none'

### Why are the changes needed?
![image](https://user-images.githubusercontent.com/89562186/179639700-0d339544-0a46-42e1-8c84-c5affcc4cd33.png)

This prevents the user to highlight the button, a small enhancement to the user experience.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Building the docs on local.

Closes #37222 from Transurgeon/master.

Authored-by: William Zijie <308c450284fbecfb3bda5be826a9fa0b65732f17@gmail.com>
Signed-off-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

witgo/spark,holdenk/spark,mahak/spark,nchammas/spark,dongjoon-hyun/spark,gengliangwang/spark,rednaxelafx/apache-spark,apache/spark,witgo/spark,srowen/spark,WeichenXu123/spark,apache/spark,wangyum/spark,apache/spark,srowen/spark,HyukjinKwon/spark,vinodkc/spark,zero323/spark,ueshin/apache-spark,holdenk/spark,zzcclp/spark,wangyum/spark,gengliangwang/spark,zzcclp/spark,vinodkc/spark,witgo/spark,wangyum/spark,hvanhovell/spark,zero323/spark,shaneknapp/spark,zzcclp/spark,srowen/spark,zero323/spark,HyukjinKwon/spark,WeichenXu123/spark,hvanhovell/spark,zero323/spark,HyukjinKwon/spark,wangyum/spark,zzcclp/spark,zzcclp/spark,hvanhovell/spark,apache/spark,apache/spark,ueshin/apache-spark,dongjoon-hyun/spark,WeichenXu123/spark,dongjoon-hyun/spark,vinodkc/spark,vinodkc/spark,ueshin/apache-spark,wangyum/spark,WeichenXu123/spark,holdenk/spark,witgo/spark,shaneknapp/spark,gengliangwang/spark,zero323/spark,nchammas/spark,zero323/spark,witgo/spark,hvanhovell/spark,gengliangwang/spark,mahak/spark,shaneknapp/spark,ueshin/apache-spark,WeichenXu123/spark,witgo/spark,mahak/spark,vinodkc/spark,dongjoon-hyun/spark,HyukjinKwon/spark,zzcclp/spark,mahak/spark,mahak/spark,ueshin/apache-spark,rednaxelafx/apache-spark,rednaxelafx/apache-spark,vinodkc/spark,srowen/spark,nchammas/spark,rednaxelafx/apache-spark,witgo/spark,WeichenXu123/spark,HyukjinKwon/spark,rednaxelafx/apache-spark,mahak/spark,srowen/spark,wangyum/spark,shaneknapp/spark,gengliangwang/spark,dongjoon-hyun/spark,gengliangwang/spark,wangyum/spark,nchammas/spark,rednaxelafx/apache-spark,shaneknapp/spark,shaneknapp/spark,zero323/spark,holdenk/spark,apache/spark,holdenk/spark,nchammas/spark,HyukjinKwon/spark,HyukjinKwon/spark,holdenk/spark,apache/spark,rednaxelafx/apache-spark,WeichenXu123/spark,nchammas/spark,shaneknapp/spark,srowen/spark,mahak/spark,dongjoon-hyun/spark,hvanhovell/spark,hvanhovell/spark,vinodkc/spark,ueshin/apache-spark,nchammas/spark,dongjoon-hyun/spark,holdenk/spark,gengliangwang/spark,hvanhovell/spark,zzcclp/spark,srowen/spark,ueshin/apache-spark