Brave-browser: Consider documenting command-line switches

[bsclifton]

Carried over from https://github.com/brave/browser-laptop/issues/388

There's a fairly exhaustive list available here:
https://peter.sh/experiments/chromium-command-line-switches/

[bbondy]

We document our own here: https://github.com/brave/brave-browser/wiki/Custom-Brave-switches but I think this issue is meant for the whole product including Chromium ones.

[dannyob]

I think this also concerns the ability to open new URLs in a currently running instance of Brave from the command line, which is a common way Unix systems implement opening URLs from other programs.

[Alf0nso]

I'm not sure if this is the right place to ask about it, but is there any sort of flag/switch to reload a page in brave? more specifically to reload the last page that was opened?