Fix reading of horizontal field of view for ray-traced plots

[paulromano]

Description

I noticed that RayTracePlot writes the horizontal field of view to the <horizontal_field_of_view> element in the XML file, but the C++ side was not checking the right name. This PR fixes that and also updates the docstrings for the WireframeRayTracePlot and SolidRayTracePlot classes to include all attributes that can be set.

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[pshriwise]

Looks good. Thanks @paulromano!

[gridley]

good catch, sorry about that!