[bind10-dev] description per specification item

[Likun Zhang]

> Should we have item_description? I think so for purpose of
> self-documenting. (We do have module and command description.)
> 
> Any comment? (I can open ticket and code this.)

I remember we had it in our first parkinglot, but forget why we lost it in
our following code.

+1 for your idea, jeremy.

Likun