DOC: Fix examples in documentation
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @MomIsBestFriend! 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 2020-02-27 17:35:24 UTC Flake8 errors in CI:

##[error]./pandas/core/generic.py:2217:89:E501:line too long (94 > 88 characters) Restarting azure A bit unsure about this, but I think it's reasonable. At least we test all what we can test.

You have conflicts to fix. Also, for inline comments (with `#`), please leave two spaces instead of one before the hash. That's PEP-8, not sure why the PEP-8 validation is not complaining, I guess we don't have it active in the CI because there are failing cases.

Also, why `describe` output is not deterministic? I think it should. Thanks for the fixes @MomIsBestFriend. About the `describe`, why do we need to skip the tests? Isn't the output deterministic?

@jreback, if you want to have another look and see if your comments were addressed... > Thanks for the fixes @MomIsBestFriend. About the `describe`, why do we need to skip the tests? Isn't the output deterministic?
> 

I haven't got it to work without the skip maybe one of the core developers knows something? > I haven't got it to work without the skip maybe one of the core developers knows something?

Do you know what was the error? Thanks for fixing those @MomIsBestFriend.

Do you mind opening an issue for the `describe`? I think the output should be deterministic and we shouldn't need the `SKIP` there. Would be good to have a look and know what's wrong.