docs:fix typesetting rendering

[microcassidy]

• Are there docstrings ? Do they follow the numpydoc style ?
  - [ ] Have you run the tests by doing nosetests or py.test at the root of the repo ?_
  ~~- [ ] Have you checked that the doc builds properly and that any new file has been added to the repo ? How to do that is ~~covered in the documentation.
  - [ ] Is there a unit test for the proposed code modification ? If the PR addresses an issue, the test should make sure the issue is fixed.
  - [ ] Last but not least, did you document the proposed change in the CHANGELOG file ? It should go under "Unreleased".

Hello,

I needed some of your docs for my own work and noticed that some parts weren't rendering correctly. I've just made some minor changes for the errant double escaping of TeX strings. I can update the CHANGELOG if needs be but I suspect it's not necessary for something like this.

All the best,
Michael