The DTD requires elements in certain order, scanner itself doesn't.
Anyway, fix the warning with a simple reordering to match how all other
protocols are written.

Fixes:
protocol:107: element request: validity error : Element request content
does not follow the DTD, expecting (description? , arg*), got (arg
description )
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>