Document Security section of the Release Notes

Change-Id: I4d0c00271c2a8ce53a50769cecf88d9b8f1aaebb
Issue-ID: DOC-270
Signed-off-by: Gildas Lanilis <gildas.lanilis@huawei.com>
(cherry picked from commit 8764d78f63c210f7b4efd5fd2ed0d12858d950c6)
1 file changed