Support math equations in documentation

[ni-jfitzger]

nirfsg has some attributes and functions which refer to math equations (which were probably lost in the process of creating the Python help from C Help).

Here's an example documentation page for the C API: https://www.ni.com/docs/en-US/bundle/ni-rfsg-c-api-ref/page/cvirfsg/nirfsg_attr_offset_units.html

We don't have any existing documentation with equations, that I'm aware of, so we'll most likely need to add support.

Sphinx has multiple extensions for math.
Apparently LaTeX is "the de-facto standard for plain-text math notation", but I'm not at all familiar with it.