DOC: Removed Notes from DataFrame.applymap
- closes #31620 

Documentation screenshot: 
![Screenshot from 2020-02-05 17-08-33](https://user-images.githubusercontent.com/39258575/73838709-5172c300-483a-11ea-96b4-6faa1918b73f.png)

Please review this @TomAugspurger  Thanks @r0cketr1kky 

Looks like you've checked in some unwanted files (e.g.  `doc/make.spec`) - could you please [unstage them](https://docs.gitlab.com/ee/university/training/topics/unstage.html)? Hello @r0cketr1kky! 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 2020-03-31 13:43:31 UTC Please review this! This seems stale. @r0cketr1kky if you want to finish this (mainly remove the unrelated changes), please open a PR or ping us here to reopen. Thanks! Sorry for being late! I just noticed this @datapythonista ! Can you reopen this? I'll revert back with the changes. @r0cketr1kky can you merge master and update It doesn't look to me like this issue is actually solved.
I hope to get it solved in #34183 Closing as #34183 was merged and closed the issue - congrats @alonme for a really impressive contribution!