[MINOR][DOCS][PYTHON] Document datetime.timedelta <> DayTimeIntervalType
[MINOR][DOCS][PYTHON] Document datetime.timedelta <> DayTimeIntervalType

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

This PR proposes to document datetime.timedelta support in PySpark in SQL DataType reference page. This support was added in SPARK-37275

### Why are the changes needed?

To show the support of datetime.timedelta.

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

Yes, this fixes the documentation.

### How was this patch tested?

CI in this PR should validate the build.

Closes #37939 from HyukjinKwon/minor-daytimeinterval.

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

hvanhovell/spark,HyukjinKwon/spark,ueshin/apache-spark,dongjoon-hyun/spark,witgo/spark,ueshin/apache-spark,HyukjinKwon/spark,hvanhovell/spark,vinodkc/spark,ueshin/apache-spark,vinodkc/spark,shaneknapp/spark,apache/spark,mahak/spark,witgo/spark,zzcclp/spark,HyukjinKwon/spark,dongjoon-hyun/spark,mahak/spark,apache/spark,holdenk/spark,zzcclp/spark,mahak/spark,apache/spark,srowen/spark,hvanhovell/spark,zzcclp/spark,apache/spark,shaneknapp/spark,zzcclp/spark,witgo/spark,zzcclp/spark,wangyum/spark,wangyum/spark,wangyum/spark,shaneknapp/spark,apache/spark,srowen/spark,srowen/spark,shaneknapp/spark,srowen/spark,dongjoon-hyun/spark,srowen/spark,shaneknapp/spark,apache/spark,witgo/spark,HyukjinKwon/spark,ueshin/apache-spark,hvanhovell/spark,HyukjinKwon/spark,holdenk/spark,vinodkc/spark,dongjoon-hyun/spark,holdenk/spark,hvanhovell/spark,mahak/spark,srowen/spark,ueshin/apache-spark,holdenk/spark,HyukjinKwon/spark,vinodkc/spark,vinodkc/spark,mahak/spark,ueshin/apache-spark,zzcclp/spark,ueshin/apache-spark,shaneknapp/spark,wangyum/spark,mahak/spark,HyukjinKwon/spark,srowen/spark,vinodkc/spark,holdenk/spark,dongjoon-hyun/spark,hvanhovell/spark,hvanhovell/spark,dongjoon-hyun/spark,witgo/spark,holdenk/spark,shaneknapp/spark,dongjoon-hyun/spark,holdenk/spark,vinodkc/spark,mahak/spark,wangyum/spark,wangyum/spark,zzcclp/spark,witgo/spark,apache/spark,wangyum/spark,witgo/spark