Reformat method synopsis whitespaces

Hi Everyone,

I'm looking for feedback with regard to my PR which reformats method
synopses (https://github.com/php/phd/pull/38):

Currently, we display function/method signatures without any line breaks,
but with a lot of unnecessary spaces between parameters, as well as around
the parameter list. See an example here: https://pasteboard.co/K4BXRuv.png

My PR would add a line break for each parameter as well as remove any other
unnecessary whitespaces. See https://pasteboard.co/K4BZNN9.png for example
(but the linked PR has a few more images attached).

I'm curious if anybody sees any issue with the new formatting? Class
synopses look a bit weird, but I don't think it's worse than what we
currently have.

Regards:
Máté