Ion modes need clarification

[kslong]

The ionization modes need to be documented on Sphinx, and in addition we need to understand what we want the one that says on.the.spot to do.

As far as I can tell the on.the.spot ionization mode is one in which there is no attempt to balance heating and cooling and it sets t_e and t_r to t_r. As I recall, the origin LM approach set t_e to 0.9 t_r.

[kslong]

Currently, there is an empty Sphinx page for the parameter. I have updated it

It is roughly here in ones local version of Python, assuming one reruns sphinx

docs/sphinx/html/input/parameters/wind/Wind/Wind.ionization.html#wind-ionization

and should hopefully get to

https://agnwinds.readthedocs.io/en/dev/input/parameters/wind/Wind/Wind.ionization.html#wind-ionization

@Higginbottom could you look at this page after locating it in your repository, and see if it needs updates.