CLN: Format doc code blocks
Trying to make code blocks in documentation black compliant. Also a small update to the flake8-rst config making max-line-length equal to 88.
> Thanks @dsaxton is there a tool to do/check this?

I was using this one which seems quite good https://github.com/asottile/blacken-docs > > Thanks @dsaxton is there a tool to do/check this?
> 
> I was using this one which seems quite good https://github.com/asottile/blacken-docs

cool. is there lots to do? is this good first issue material? > cool. is there lots to do? is this good first issue material?

I think this covers all or most of it (but of course doesn't handle updates to the docs) Thanks @dsaxton 