[Docs] Remove  multiple Update Pack sections
[Docs] Remove  multiple Update Pack sections

In 16.10 the ability to have multiple sections in
Update Packs was removed, this is to catch the
docs up to that change.

Resolves: LE-6232
Change-Id: Ic434faa7dac727f89ca92bd18fcee33c214e4fbe

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af