Add inline example to psislw

[canyon289]

Add inline docs to psislw. @pawanakhil You're welcome to claim this one first!

https://arviz-devs.github.io/arviz/generated/arviz.psislw.html#arviz.psislw

[akhill10]

Yeah , I will work on this .

[canyon289]

Great! This PR is a really good example on how to add extra examples to docs. https://github.com/arviz-devs/arviz/pull/937/files

Instructions on how to compile the docs should be in CONTRIBUTING.md if you run into issues feel free to reach out!

[smit-s]

@canyon289 This issue doesn't seem to have been addressed. Can I work on this?

[aloctavodia]

@smit-s I think you can work on this. Thanks in advance!

[smit-s]

@aloctavodia Inline example does not exist for r2_score. Shall I add an example for it as well?

[OriolAbril]

Yes! We created independent issues for some functions to make the tasks more accessible, but all functions missing it would welcome an example in the docstring, see #491. (exceptions would probably be from_xyz methods if compiling and running the model takes a lot of time as it would slow doc generation)