Docs do not mention all of the values under pydrad.parse.Profile

[jwreep]

After #169, we added a parsing of all the data in the .trm files, but we did not add their descriptions to the Docs.
(https://pydrad.readthedocs.io/en/latest/api/pydrad.parse.Profile.html)

[wtbarnes]

The reason these are not documented is because the properties associated with the trm data are generated on the fly on import since there are so many of those quantities and they may not exist for each HYDRAD run.

Since these properties are all known (unlike, say, the NEI fractions which vary according to the simulation setup), we could hardcode all of these docstrings similarly to what is done for some of the other properties. This would be overly verbose and would make the parse.py file quite long.

Alternatively, there may be some way to auto-generate these docstrings not at import such that they would be included in the rendered docs. Off the top of my head, I'm not sure how to do this, though I think it is possible.