[Docs] Add Release Notes for 18.10.2
[Docs] Add Release Notes for 18.10.2

Resolves: LE-11948
Change-Id: Iceb373585c1918c71c1e8793c41e117f0e0d3619

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