issue paper structure

Hi folks
I think I fixed the problems with the issue paper structure.
See Conversational-Voice-Systems.html
<https://raw.githack.com/w3c/coga/issue-papers-v2/issue-papers/Conversational-Voice-Systems.html>

Are we ok with this? If so I can start putting the other review ready
drafts in.
-- 
All the best

Lisa Seeman-Horwitz

LinkedIn <http://il.linkedin.com/in/lisaseeman/>, Twitter
<https://twitter.com/SeemanLisa>