Long (-- style) options (.Fl) with mdoc(7)

[Yuri Pankov]

Steffen Nurpmeso wrote:
> Hello.
> 
> The very moment i have seen a showmount(8) change fly by, and
> wanted to make you aware of the persuading approach that NetBSD's
> wizd(8) uses, namely ".Fl Fl long-option".  Different to ".Fl
> -long-option" this produces visually appealing results on all
> output devices.

mandoc style guide advises differently:

https://mandoc.bsd.lv/mdoc/style/options.html

It's not authoritative, of course, but I'm not aware of any other mdoc 
style guide.  May be you could take it up to style guide/mandoc authors?