Update the HelpHead* highlight group names in developer.xml.
Update the HelpHead* highlight group names in developer.xml.

--HG--
extra : rebase_source : d1aa4b17c0d8a9c0b64191d43de89a5bfb2bfab2

madand/pentadactyl-pm,Kjwon15/dactyl,5digits/dactyl,Kjwon15/dactyl,invl/dactyl,nathyong/dactyl,5digits/dactyl,5digits/dactyl,moonshadow/dactyl,Kjwon15/dactyl,moonshadow/dactyl,airodactyl/dactyl,invl/dactyl,madand/pentadactyl-pm,madand/pentadactyl-pm,invl/dactyl,madand/pentadactyl-pm,Kjwon15/dactyl,nathyong/dactyl,invl/dactyl,nathyong/dactyl,Kjwon15/dactyl,nathyong/dactyl,airodactyl/dactyl,airodactyl/dactyl,Kjwon15/dactyl,madand/pentadactyl-pm,5digits/dactyl,5digits/dactyl,invl/dactyl,airodactyl/dactyl,madand/pentadactyl-pm,nathyong/dactyl,invl/dactyl,nathyong/dactyl,moonshadow/dactyl,moonshadow/dactyl,moonshadow/dactyl,airodactyl/dactyl,airodactyl/dactyl,5digits/dactyl,moonshadow/dactyl