Fix issues with ESS docstring. (#1149)
Fix issues with ESS docstring. (#1149)

* Fix formatting of ess() docstring.

A piece of the embedded LaTeX wasn't being formatted properly.
Also added a note about the default value of "method".

* Add requirements needed for docs.

Sphinx extensions and bokeh requirements were missing from the developer requirements.

* Update diagnostics.py

* Update requirements-dev.txt

* Update requirements-dev.txt

* Update diagnostics.py

Co-authored-by: Osvaldo Martin <7bdfdb6c58e7de785941ed25d34779031d57b1dc@gmail.com>
arviz-devs/arviz,arviz-devs/arviz,arviz-devs/arviz,arviz-devs/arviz