M. Eric Irrgang authored Dec 12, 2019 and M. Eric Irrgang committed Dec 26, 2019

* Fix typos or syntax for several text literals that Sphinx tries to
  process as interpreted text (in the default role).
* Use Google docstring conventions to guide adjustment of gmxapi
  docstrings.

Change-Id: If6eeede8dcc782c04fc4363005c38c746a8664ea