Format docstrings for SciML style

[ArnoStrouwen]

I've been running my own fork of JuliaFormatter with docstring formatting switched on:
https://github.com/domluna/JuliaFormatter.jl/blob/master/src/styles/sciml/pretty.jl#L39
It seems to work well.
When a new release comes for #792, and we start formatting all the SciML repos again, we might also want to switch this on, @ChrisRackauckas?

[domluna]

there might more to it but you don't need your own fork to have format_docstrings turned on you can just add it to your config file .JuliaFormatter.toml

format_docstrings = true