DOC: Create documentation for logprob submodule

[michaelraczycki]

Issue with current documentation:

Currently documentation doesn't cover the logprob submodule, write some starter doc using comments from #6465 and all information you have on the subject.

Idea or request for content:

-Why it's needed
-Main functionality
-Classes it contains

[michaelraczycki]

I've created this issue after consulting the need for it with @ricardoV94 , I'll work on it as soon as possible.

[OriolAbril]

related to #5282 which also lists other functions missing from docs

[michaelraczycki]

@ricardoV94, I'm not sure whether I should add the in-line docs or is there a way to add a page about logprob into the official PyMC docs?

[OriolAbril]

The functions/classes need to have docstrings following numpydoc and be listed in one of the files at https://github.com/pymc-devs/pymc/tree/main/docs/source/api

[ricardoV94]

More importantly, the logprob submodule itself should have a custom documentation page. @OriolAbril is there a good way to do this with markdown? Asking because all those files are .rst

[OriolAbril]

most markdown it can be is something like: https://github.com/arviz-devs/arviz/blob/main/doc/source/api/plot_utils.md?plain=1

[michaelraczycki]

I got a bit caught up with other topics, so this one is free to take again