bug#50880: [External] : bug#50880: Add "Contributing to Emacs" help command (see C-h C-h)

[Drew Adams]

> And I already said what I think about it: to me it sounds like a waste
> to reserve a C-h key for that.  It doesn't even belong to "help" per
> se, IMO.

+1.

Just because some key is not yet taken, that's not a
good reason to assign it eagerly or willy nilly.

And to me this sounds like such an assignment - this
doesn't need a key sequence.  The need identified
was just to call more attention to it.