Cln 31942/replace appender with doc 6
- [x] ref #31942
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- fixes issues with the introduction of the doc decorator

Hello @smartvinnetou! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:







There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-06-23 21:39:19 UTC @smartvinnetou Are you still working on this? If so, mark as ready for review when ready or close. Closing as this appears stale, but @smartvinnetou ping if you'd like to pick back up and can reopen