### What changes were proposed in this pull request?
This PR proposes to document PySpark specific packaging guidelines.
### Why are the changes needed?
To have a single place for PySpark users, and better documentation.
### Does this PR introduce _any_ user-facing change?
Yes
### How was this patch tested?
```
cd python/docs
make clean html
```
Closes#29806 from fhoering/add_doc_python_packaging.
Lead-authored-by: Fabian Höring <f.horing@criteo.com>
Co-authored-by: Hyukjin Kwon <gurwls223@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
