fixed doctest in styler.to_latex
- [] closes #42672
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Hello @willie3838! 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 2021-07-25 16:19:49 UTC the reason I suggested this as skip doc test is because this is the docstring for `Styler.to_latex` but the code example here which is `s.render()` is generating HTML. It is  unnecessary to show the output in this docstring - the code is provided as a comparative example to demonstrate the difference in input between HTML and LaTeX, where users will typically be used to the former.

 Thanks @attack68, I missed this was the issue you made the comment to. Happy with that too. Using ellipsis also seems as a reasonable approach to me, also fine, whatever you prefer @willie3838 I think.