Housekeeping work in backends.html

[Eric Botcazou]

> Perhaps 'd' should just go away completely. It was intended to
> distinguish between ports using the old scheduler description and
> ports using the DFA model. But support for the old scheduler
> description was removed some 10 years ago, and AFAIR the targets that
> don't use the DFA scheduler don't use the scheduler at all.

Yes, this makes sense, I'll do it (if you don't beat me to it), thanks.

-- 
Eric Botcazou