[DOC] Enhance the documentation for topological order learning methods

[adam2392]

Another high-level comment I have is to ask if you can add some intuition to the hyper parameters of each algorithm, so that it can inform users on how to select them. Some strategies:

1. Include some blurbs in the Notes section of the docstrings of the algorithms
2. Include an additional module, similar to constraint_causal_discovery.rst, which sort of gives a more user-friendly introduction to these topological ordering methods.
3. some combination of the above

We can also include this in a downstream PR.

Originally posted by @francescomontagna in #129 (comment)

[adam2392]

@francescomontagna are you still interested in submitting a PR to document the concepts behind these methods? This will help ensure more usage and proper understanding of the methods.

[francescomontagna]

Hi @adam2392 , sorry for disappearing for a while! And thanks for the PR merging and all the hard work you put in it.
So, the idea is to focus on the hyperparameters and use this as a starting point to explain the logic behind the methods, if I understand correctly. Is that it?

[adam2392]

Yes I think just a gentle introduction to the class of methods and what are some important design decisions to make. This is almost like a "user guide" for the user, such that they can properly use and cite the methods.