CLN: replaced Appender with doc
- [x] ref #31942
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] replaced the Appender/Substitute decorators with doc

Can you fix merge conflicts? Can you fix up merge conflict again? If so can merge @smartvinnetou can you fix conflicts? Will do.

On Thu, 10 Sep 2020, 20:04 William Ayd, <notifications@github.com> wrote:

> @smartvinnetou <https://github.com/smartvinnetou> can you fix conflicts?
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 one more rebase pls 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 2020-09-13 19:38:05 UTC Rebase done. Still some glitches in the doctests. Will keep fixing. thanks @smartvinnetou  keep em coming