Documentation updates for Euphrates

Documentation updates for Euphrates

Installer projects/PTLs and scenario owners
Should review the installation instruction to make sure
that relevant documentation is included.

Feature projects/PTLs
Should review the configuration guide and user guide to
make sure that relevant documentation is included.

All projects (participating in the Euphrates release)
Should review the release notes to make sure that project
specific release notes are included.

Change-Id: I9d72070a22d77545225b07019a1133fcfd57257f
Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>
(cherry picked from commit 4122031515a288133175c8c7eb2213b67c712e2a)