Unclear parameters in exo handler

[ppinchuk]

sup3r version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://natlabrockies.github.io/sup3r/_autosummary/sup3r.preprocessing.rasterizers.exo.BaseExoRasterizer.html#sup3r.preprocessing.rasterizers.exo.BaseExoRasterizer

Documentation problem

The relationship/difference between file_paths and source_files as well as input_handler_kwargs and source_handler_kwargs is not entirely obvious for a newcome to sup3r like me. It's possible that you explain this difference somewhere in a tutorial, which would be on me for not looking.

Suggested fix for documentation

Either clarify the purpose, relationship, or difference between the two different inputs or provide a clickable link to an example that new users can reference to understand the difference between the two inputs and what they represent/why they are required for the exo inputs.